diff --git a/common/src/main/scala/net/psforever/objects/GlobalDefinitions.scala b/common/src/main/scala/net/psforever/objects/GlobalDefinitions.scala
index a3b2164c7..df99f93c9 100644
--- a/common/src/main/scala/net/psforever/objects/GlobalDefinitions.scala
+++ b/common/src/main/scala/net/psforever/objects/GlobalDefinitions.scala
@@ -51,24 +51,51 @@ object GlobalDefinitions {
   Implants
    */
   val advanced_regen = ImplantDefinition(0)
+  advanced_regen.InitializationDuration = 120000
+  advanced_regen.StaminaCost = 2
+  advanced_regen.CostIntervalDefault = 500
 
   val targeting = ImplantDefinition(1)
+  targeting.InitializationDuration = 60000
 
   val audio_amplifier = ImplantDefinition(2)
+  audio_amplifier.InitializationDuration = 60000
+  audio_amplifier.StaminaCost = 1
+  audio_amplifier.CostIntervalDefault = 1000
 
   val darklight_vision = ImplantDefinition(3)
+  darklight_vision.InitializationDuration = 60000
+  darklight_vision.ActivationStaminaCost = 3
+  darklight_vision.StaminaCost = 1
+  darklight_vision.CostIntervalDefault = 500
 
   val melee_booster = ImplantDefinition(4)
+  melee_booster.InitializationDuration = 120000
+  melee_booster.StaminaCost = 10
 
   val personal_shield = ImplantDefinition(5)
+  personal_shield.InitializationDuration = 120000
+  personal_shield.StaminaCost = 1
+  personal_shield.CostIntervalDefault = 600
 
   val range_magnifier = ImplantDefinition(6)
+  range_magnifier.InitializationDuration = 60000
 
   val second_wind = ImplantDefinition(7)
+  second_wind.InitializationDuration = 180000
 
   val silent_run = ImplantDefinition(8)
+  silent_run.InitializationDuration = 90000
+  silent_run.StaminaCost = 1
+  silent_run.CostIntervalDefault = 333
+  silent_run.CostIntervalByExoSuitHashMap(ExoSuitType.Agile) = 1000
 
   val surge = ImplantDefinition(9)
+  surge.InitializationDuration = 90000
+  surge.StaminaCost = 1
+  surge.CostIntervalDefault = 1000
+  surge.CostIntervalByExoSuitHashMap(ExoSuitType.Agile) = 500
+  surge.CostIntervalByExoSuitHashMap(ExoSuitType.Reinforced) = 333
 
   /*
   Projectiles
diff --git a/common/src/main/scala/net/psforever/objects/ImplantSlot.scala b/common/src/main/scala/net/psforever/objects/ImplantSlot.scala
index a8ddbbfbf..5fed4a504 100644
--- a/common/src/main/scala/net/psforever/objects/ImplantSlot.scala
+++ b/common/src/main/scala/net/psforever/objects/ImplantSlot.scala
@@ -1,7 +1,8 @@
 // Copyright (c) 2017 PSForever
 package net.psforever.objects
 
-import net.psforever.objects.definition.{ImplantDefinition, Stance}
+import akka.actor.Cancellable
+import net.psforever.objects.definition.ImplantDefinition
 import net.psforever.types.{ExoSuitType, ImplantType}
 
 /**
@@ -18,11 +19,21 @@ class ImplantSlot {
   private var unlocked : Boolean = false
   /** whether this implant is ready for use */
   private var initialized : Boolean = false
+  /** a cancellable timer that can be used to set an implant as initialized once complete */
+  private var initializeTimer: Cancellable = DefaultCancellable.obj
+
   /** is this implant active */
   private var active : Boolean = false
   /** what implant is currently installed in this slot; None if there is no implant currently installed */
   private var implant : Option[ImplantDefinition] = None
 
+  def InitializeTimer : Cancellable = initializeTimer
+
+  def InitializeTimer_=(timer : Cancellable) : Cancellable = {
+    initializeTimer = timer
+    initializeTimer
+  }
+
   def Unlocked : Boolean = unlocked
 
   def Unlocked_=(lock : Boolean) : Boolean = {
@@ -78,12 +89,12 @@ class ImplantSlot {
     case ImplantType.None =>
       -1L
     case _ =>
-      Installed.get.Initialization
+      Installed.get.InitializationDuration
   }
 
   def ActivationCharge : Int =  {
     if(Active) {
-      Installed.get.ActivationCharge
+      Installed.get.ActivationStaminaCost
     }
     else {
       0
@@ -92,15 +103,13 @@ class ImplantSlot {
 
   /**
     * Calculate the stamina consumption of the implant for any given moment of being active after its activation.
-    * As implant energy use can be influenced by both exo-suit worn and general stance held, both are considered.
     * @param suit the exo-suit being worn
-    * @param stance the player's stance
     * @return the amount of stamina (energy) that is consumed
     */
-  def Charge(suit : ExoSuitType.Value, stance : Stance.Value) : Int = {
+  def Charge(suit : ExoSuitType.Value) : Int = {
     if(Active) {
       val inst = Installed.get
-      inst.DurationChargeBase + inst.DurationChargeByExoSuit(suit) + inst.DurationChargeByStance(stance)
+      inst.StaminaCost
     }
     else {
       0
diff --git a/common/src/main/scala/net/psforever/objects/Player.scala b/common/src/main/scala/net/psforever/objects/Player.scala
index d00227f7a..d3ad3738a 100644
--- a/common/src/main/scala/net/psforever/objects/Player.scala
+++ b/common/src/main/scala/net/psforever/objects/Player.scala
@@ -1,6 +1,7 @@
 // Copyright (c) 2017 PSForever
 package net.psforever.objects
 
+import akka.actor.ActorRef
 import net.psforever.objects.avatar.LoadoutManager
 import net.psforever.objects.definition.{AvatarDefinition, ExoSuitDefinition, SpecialExoSuitDefinition}
 import net.psforever.objects.equipment.{Equipment, EquipmentSize, EquipmentSlot, JammableUnit}
@@ -49,6 +50,7 @@ class Player(private val core : Avatar) extends PlanetSideServerObject
   private var crouching : Boolean  = false
   private var jumping : Boolean = false
   private var cloaked : Boolean = false
+  private var fatigued : Boolean = false // If stamina drops to 0, player is fatigued until regenerating at least 20 stamina
 
   private var vehicleSeated : Option[PlanetSideGUID] = None
 
@@ -138,8 +140,13 @@ class Player(private val core : Avatar) extends PlanetSideServerObject
 
   def Stamina : Int = stamina
 
-  def Stamina_=(assignEnergy : Int) : Int = {
-    stamina = if(isAlive) { math.min(math.max(0, assignEnergy), MaxStamina) } else { 0 }
+  def Stamina_=(assignStamina : Int) : Int = {
+    stamina = if(isAlive) { math.min(math.max(0, assignStamina), MaxStamina) } else { 0 }
+
+    if(Actor != ActorRef.noSender) {
+      Actor ! Player.StaminaChanged(Stamina)
+    }
+
     Stamina
   }
 
@@ -373,6 +380,8 @@ class Player(private val core : Avatar) extends PlanetSideServerObject
     */
   def Implant(slot : Int) : ImplantType.Value = core.Implant(slot)
 
+  def ImplantSlot(slot: Int) : ImplantSlot = core.Implants(slot)
+
   /**
     * A read-only `Array` of tuples representing important information about all unlocked implant slots.
     * @return a maximum of three implant types, initialization times, and active flags
@@ -411,6 +420,12 @@ class Player(private val core : Avatar) extends PlanetSideServerObject
     Cloaked
   }
 
+  def Fatigued : Boolean = fatigued
+  def Fatigued_=(isFatigued : Boolean) : Boolean = {
+    fatigued = isFatigued
+    Fatigued
+  }
+
   def PersonalStyleFeatures : Option[Cosmetics] = core.PersonalStyleFeatures
 
   def AddToPersonalStyle(value : PersonalStyle.Value) : (Option[Cosmetics], Option[Cosmetics]) = {
@@ -637,6 +652,12 @@ object Player {
   final val HandsDownSlot : Int = 255
 
   final case class Die()
+  final case class ImplantActivation(slot : Int, status : Int)
+  final case class ImplantInitializationStart(slot : Int)
+  final case class UninitializeImplant(slot : Int)
+  final case class ImplantInitializationComplete(slot : Int)
+  final case class DrainStamina(amount : Int)
+  final case class StaminaChanged(currentStamina : Int)
 
   def apply(core : Avatar) : Player = {
     new Player(core)
diff --git a/common/src/main/scala/net/psforever/objects/avatar/PlayerControl.scala b/common/src/main/scala/net/psforever/objects/avatar/PlayerControl.scala
index cffa60dfd..0f8dc5025 100644
--- a/common/src/main/scala/net/psforever/objects/avatar/PlayerControl.scala
+++ b/common/src/main/scala/net/psforever/objects/avatar/PlayerControl.scala
@@ -2,17 +2,20 @@
 package net.psforever.objects.avatar
 
 import akka.actor.Actor
-import net.psforever.objects.Player
+import net.psforever.objects.{DefaultCancellable, ImplantSlot, Player}
 import net.psforever.objects.ballistics.{PlayerSource, ResolvedProjectile, SourceEntry}
+import net.psforever.objects.definition.ImplantDefinition
 import net.psforever.objects.equipment.{JammableBehavior, JammableUnit}
 import net.psforever.objects.vital.{PlayerSuicide, Vitality}
 import net.psforever.objects.zones.Zone
 import net.psforever.packet.game._
-import net.psforever.types.{ExoSuitType, PlanetSideGUID}
+import net.psforever.types.{ExoSuitType, ImplantType, PlanetSideGUID}
 import services.Service
 import services.avatar.{AvatarAction, AvatarServiceMessage}
 
 import scala.concurrent.duration._
+import scala.collection.mutable
+import scala.concurrent.ExecutionContext.Implicits.global
 
 /**
   * na;
@@ -25,7 +28,86 @@ class PlayerControl(player : Player) extends Actor
   private [this] val log = org.log4s.getLogger(player.Name)
   private [this] val damageLog = org.log4s.getLogger("DamageResolution")
 
+  // A collection of timers for each slot to trigger stamina drain on an interval
+  val implantSlotStaminaDrainTimers = mutable.HashMap(0 -> DefaultCancellable.obj, 1 -> DefaultCancellable.obj, 2 -> DefaultCancellable.obj)
+
   def receive : Receive = jammableBehavior.orElse {
+    case Player.ImplantActivation(slot: Int, status : Int) =>
+      // todo: disable implants with stamina cost when changing armour type
+      val implantSlot = player.ImplantSlot(slot)
+
+      if(status == 0 && implantSlot.Active) {
+        // Cancel stamina drain timer
+        implantSlotStaminaDrainTimers(slot).cancel()
+        implantSlotStaminaDrainTimers(slot) = DefaultCancellable.obj
+
+        implantSlot.Active = false
+        player.Zone.AvatarEvents ! AvatarServiceMessage(player.Zone.Id, AvatarAction.PlanetsideAttribute(player.GUID, 28, player.Implant(slot).id * 2)) // Deactivation sound / effect
+        player.Zone.AvatarEvents ! AvatarServiceMessage(player.Zone.Id, AvatarAction.DeactivateImplantSlot(player.GUID, slot))
+      } else if (status == 1 && implantSlot.Initialized && !implantSlot.Active && !player.Fatigued) {
+        implantSlot.Installed match {
+          case Some(implant: ImplantDefinition) =>
+            implantSlot.Active = true
+
+            if (implant.ActivationStaminaCost >= 0) {
+              player.Stamina -= implant.ActivationStaminaCost // Activation stamina drain
+            }
+
+            if(implant.StaminaCost > 0 && implant.GetCostIntervalByExoSuit(player.ExoSuit) > 0) { // Ongoing stamina drain, if applicable
+              implantSlotStaminaDrainTimers(slot) = context.system.scheduler.schedule(0 seconds, implant.GetCostIntervalByExoSuit(player.ExoSuit) milliseconds, self, Player.DrainStamina(implant.StaminaCost))
+            }
+
+            player.Zone.AvatarEvents ! AvatarServiceMessage(player.Zone.Id, AvatarAction.PlanetsideAttribute(player.GUID, 28, player.Implant(slot).id * 2 + 1)) // Activation sound / effect
+            player.Zone.AvatarEvents ! AvatarServiceMessage(player.Zone.Id, AvatarAction.ActivateImplantSlot(player.GUID, slot))
+        }
+      }
+
+    case Player.UninitializeImplant(slot: Int) => {
+      PlayerControl.UninitializeImplant(player, slot)
+    }
+
+    case Player.ImplantInitializationStart(slot: Int) =>
+      val implantSlot = player.ImplantSlot(slot)
+      if(implantSlot.Installed.isDefined) {
+        if(implantSlot.Initialized) {
+          PlayerControl.UninitializeImplant(player, slot)
+        }
+
+        // Start client side initialization timer
+        player.Zone.AvatarEvents ! AvatarServiceMessage(player.Zone.Id, AvatarAction.SendResponse(player.GUID, ActionProgressMessage(slot + 6, 0)))
+
+        // Callback after initialization timer to complete initialization
+        implantSlot.InitializeTimer = context.system.scheduler.scheduleOnce(implantSlot.MaxTimer milliseconds, self, Player.ImplantInitializationComplete(slot))
+      }
+
+    case Player.ImplantInitializationComplete(slot: Int) =>
+      val implantSlot = player.ImplantSlot(slot)
+      if(implantSlot.Installed.isDefined) {
+        player.Zone.AvatarEvents ! AvatarServiceMessage(player.Zone.Id, AvatarAction.SendResponse(player.GUID, AvatarImplantMessage(player.GUID, ImplantAction.Initialization, slot, 1)))
+        implantSlot.Initialized = true
+        implantSlot.InitializeTimer = DefaultCancellable.obj
+      }
+
+    case Player.DrainStamina(amount : Int) =>
+      player.Stamina -= amount
+
+    case Player.StaminaChanged(currentStamina : Int) =>
+    if(currentStamina == 0) {
+        player.Fatigued = true
+        player.skipStaminaRegenForTurns += 4
+        for(slot <- 0 to player.Implants.length - 1) { // Disable all implants
+          self ! Player.ImplantActivation(slot, 0)
+          player.Zone.AvatarEvents ! AvatarServiceMessage(player.Zone.Id, AvatarAction.SendResponseTargeted(player.GUID, AvatarImplantMessage(player.GUID, ImplantAction.OutOfStamina, slot, 1)))
+        }
+      } else if (player.Fatigued && currentStamina >= 20) {
+        player.Fatigued = false
+        for(slot <- 0 to player.Implants.length - 1) { // Re-enable all implants
+          player.Zone.AvatarEvents ! AvatarServiceMessage(player.Zone.Id, AvatarAction.SendResponseTargeted(player.GUID, AvatarImplantMessage(player.GUID, ImplantAction.OutOfStamina, slot, 0)))
+        }
+      }
+
+      player.Zone.AvatarEvents ! AvatarServiceMessage(player.Zone.Id, AvatarAction.PlanetsideAttributeSelf(player.GUID, 2, player.Stamina))
+
     case Player.Die() =>
       PlayerControl.HandleDestructionAwareness(player, player.GUID, None)
 
@@ -233,4 +315,11 @@ object PlayerControl {
         events ! AvatarServiceMessage(zoneChannel, AvatarAction.DestroyDisplay(pentry, pentry, 0))
     }
   }
+
+  def UninitializeImplant(player: Player, slot: Int): Unit = {
+    val implantSlot = player.ImplantSlot(slot)
+
+    implantSlot.Initialized = false
+    player.Zone.AvatarEvents ! AvatarServiceMessage(player.Zone.Id, AvatarAction.SendResponse(player.GUID, AvatarImplantMessage(player.GUID, ImplantAction.Initialization, slot, 0)))
+  }
 }
diff --git a/common/src/main/scala/net/psforever/objects/definition/ImplantDefinition.scala b/common/src/main/scala/net/psforever/objects/definition/ImplantDefinition.scala
index 7984b310a..363025232 100644
--- a/common/src/main/scala/net/psforever/objects/definition/ImplantDefinition.scala
+++ b/common/src/main/scala/net/psforever/objects/definition/ImplantDefinition.scala
@@ -5,19 +5,6 @@ import net.psforever.types.{ExoSuitType, ImplantType}
 
 import scala.collection.mutable
 
-/**
-  * An `Enumeration` of a variety of poses or generalized movement.
-  */
-object Stance extends Enumeration {
-  val
-  Crouching,
-  CrouchWalking, //not used, but should still be defined
-  Standing,
-  Walking, //not used, but should still be defined
-  Running
-  = Value
-}
-
 /**
   * The definition for an installable player utility that grants a perk, usually in exchange for stamina (energy).<br>
   * <br>
@@ -25,36 +12,40 @@ object Stance extends Enumeration {
   * When activated by the user, an `activationCharge` may be deducted form that user's stamina reserves.
   * This does not necessarily have to be a non-zero value.
   * Passive implants are always active and thus have no cost.
-  * After being activated, a non-passive implant consumes a specific amount of stamina each second.
-  * This cost is modified by how the user is standing and what type of exo-suit they are wearing.
-  * The `durationChargeBase` is the lowest cost for an implant.
-  * Modifiers for exo-suit type and stance type are then added onto this base cost.
-  * For example: wearing `Reinforced` costs 2 stamina but costs only 1 stamina in all other cases.
-  * Assuming that is the only cost, the definition would have a base charge of 1 and a `Reinforced` modifier of 1.
+  * After being activated, a non-passive implant consumes a specific amount of stamina at regular intervals
+  * Some implants will specify a different interval for consuming stamina based on the exo-suit the player is wearing
   * @param implantType the type of implant that is defined
   * @see `ImplantType`
   */
 class ImplantDefinition(private val implantType : Int) extends BasicDefinition {
   ImplantType(implantType)
-  /** how long it takes the implant to spin-up; is milliseconds */
-  private var initialization : Long = 0L
+  /** how long it takes the implant to become ready for activation; is milliseconds */
+  private var initializationDuration : Long = 0L
   /** a passive certification is activated as soon as it is ready (or other condition) */
   private var passive : Boolean = false
   /** how much turning on the implant costs */
-  private var activationCharge : Int = 0
-  /** how much energy does this implant cost to remain active per second*/
-  private var durationChargeBase : Int = 0
-  /** how much more energy does the implant cost for this exo-suit */
-  private val durationChargeByExoSuit = mutable.HashMap[ExoSuitType.Value, Int]().withDefaultValue(0)
-  /** how much more energy does the implant cost for this stance */
-  private val durationChargeByStance = mutable.HashMap[Stance.Value, Int]().withDefaultValue(0)
+  private var activationStaminaCost : Int = 0
+  /** how much energy does this implant cost to remain activate per interval tick */
+  private var staminaCost : Int = 0
+
+  /**
+    * How often in milliseconds the stamina cost will be applied, per exo-suit type
+    * in game_objects.adb.lst each armour type is listed as a numeric identifier
+    * stamina_consumption_interval = Standard
+    * stamina_consumption_interval1 = Infil
+    * stamina_consumption_interval2 = Agile
+    * stamina_consumption_interval3 = Rexo
+    * stamina_consumption_interval4 = MAX?
+    */
+  private var costIntervalDefault : Int = 0
+  private val costIntervalByExoSuit = mutable.HashMap[ExoSuitType.Value, Int]().withDefaultValue(CostIntervalDefault)
   Name = "implant"
 
-  def Initialization : Long = initialization
+  def InitializationDuration : Long = initializationDuration
 
-  def Initialization_=(time : Long) : Long = {
-    initialization = math.max(0, time)
-    Initialization
+  def InitializationDuration_=(time : Long) : Long = {
+    initializationDuration = math.max(0, time)
+    InitializationDuration
   }
 
   def Passive : Boolean = passive
@@ -64,23 +55,31 @@ class ImplantDefinition(private val implantType : Int) extends BasicDefinition {
     Passive
   }
 
-  def ActivationCharge : Int = activationCharge
+  def ActivationStaminaCost : Int = activationStaminaCost
 
-  def ActivationCharge_=(charge : Int) : Int = {
-    activationCharge = math.max(0, charge)
-    ActivationCharge
+  def ActivationStaminaCost_=(charge : Int) : Int = {
+    activationStaminaCost = math.max(0, charge)
+    ActivationStaminaCost
   }
 
-  def DurationChargeBase : Int = durationChargeBase
+  def StaminaCost : Int = staminaCost
 
-  def DurationChargeBase_=(charge : Int) : Int = {
-    durationChargeBase = math.max(0, charge)
-    DurationChargeBase
+  def StaminaCost_=(charge : Int) : Int = {
+    staminaCost = math.max(0, charge)
+    StaminaCost
   }
 
-  def DurationChargeByExoSuit : mutable.Map[ExoSuitType.Value, Int] = durationChargeByExoSuit
 
-  def DurationChargeByStance : mutable.Map[Stance.Value, Int] = durationChargeByStance
+  def CostIntervalDefault : Int = {
+    costIntervalDefault
+  }
+  def CostIntervalDefault_=(interval : Int) : Int = {
+    costIntervalDefault = interval
+    CostIntervalDefault
+  }
+
+  def GetCostIntervalByExoSuit(exosuit : ExoSuitType.Value) : Int = costIntervalByExoSuit.getOrElse(exosuit, CostIntervalDefault)
+  def CostIntervalByExoSuitHashMap : mutable.Map[ExoSuitType.Value, Int] = costIntervalByExoSuit
 
   def Type : ImplantType.Value = ImplantType(implantType)
 }
diff --git a/common/src/main/scala/net/psforever/packet/game/ActionProgressMessage.scala b/common/src/main/scala/net/psforever/packet/game/ActionProgressMessage.scala
index f9d3f6d97..648232046 100644
--- a/common/src/main/scala/net/psforever/packet/game/ActionProgressMessage.scala
+++ b/common/src/main/scala/net/psforever/packet/game/ActionProgressMessage.scala
@@ -6,9 +6,9 @@ import scodec.Codec
 import scodec.codecs._
 
 /**
-  *
+  * 6,7,8 - Start implant initialization timer for slots 0,1,2 respectively. Allowed values: 0-100 (50 will start timer at 50% complete)
   */
-final case class ActionProgressMessage(unk1 : Int,
+final case class ActionProgressMessage(action : Int,
                                        unk2 : Long)
   extends PlanetSideGamePacket {
   type Packet = ActionProgressMessage
@@ -18,7 +18,7 @@ final case class ActionProgressMessage(unk1 : Int,
 
 object ActionProgressMessage extends Marshallable[ActionProgressMessage] {
   implicit val codec : Codec[ActionProgressMessage] = (
-    ("unk1" | uint4L) ::
+    ("action" | uint4L) ::
       ("unk2" | uint32L)
     ).as[ActionProgressMessage]
 }
\ No newline at end of file
diff --git a/common/src/main/scala/services/avatar/AvatarService.scala b/common/src/main/scala/services/avatar/AvatarService.scala
index 0a338ad0a..93faada03 100644
--- a/common/src/main/scala/services/avatar/AvatarService.scala
+++ b/common/src/main/scala/services/avatar/AvatarService.scala
@@ -74,6 +74,10 @@ class AvatarService(zone : Zone) extends Actor {
           AvatarEvents.publish(
             AvatarServiceResponse(s"/$forChannel/Avatar", player_guid, AvatarResponse.DeactivateImplantSlot(slot))
             )
+        case AvatarAction.ActivateImplantSlot(player_guid, slot) =>
+          AvatarEvents.publish(
+            AvatarServiceResponse(s"/$forChannel/Avatar", player_guid, AvatarResponse.ActivateImplantSlot(slot))
+          )
         case AvatarAction.DeployItem(player_guid, item) =>
           val definition = item.Definition
           val objectData = definition.Packet.ConstructorData(item).get
diff --git a/common/src/main/scala/services/avatar/AvatarServiceMessage.scala b/common/src/main/scala/services/avatar/AvatarServiceMessage.scala
index 67188d97c..e7fc9dab5 100644
--- a/common/src/main/scala/services/avatar/AvatarServiceMessage.scala
+++ b/common/src/main/scala/services/avatar/AvatarServiceMessage.scala
@@ -8,6 +8,7 @@ import net.psforever.objects.equipment.Equipment
 import net.psforever.objects.inventory.Container
 import net.psforever.objects.zones.Zone
 import net.psforever.packet.PlanetSideGamePacket
+import net.psforever.packet.game.ImplantAction
 import net.psforever.packet.game.objectcreate.{ConstructorData, ObjectCreateMessageParent}
 import net.psforever.types.{ExoSuitType, PlanetSideEmpire, PlanetSideGUID, Vector3}
 
@@ -32,6 +33,7 @@ object AvatarAction {
   final case class EnvironmentalDamage(player_guid : PlanetSideGUID, source_guid : PlanetSideGUID, amount: Int) extends Action
   final case class DeployItem(player_guid : PlanetSideGUID, item : PlanetSideGameObject with Deployable) extends Action
   final case class DeactivateImplantSlot(player_guid : PlanetSideGUID, slot : Int) extends Action
+  final case class ActivateImplantSlot(player_guid : PlanetSideGUID, slot : Int) extends Action
   final case class Destroy(victim : PlanetSideGUID, killer : PlanetSideGUID, weapon : PlanetSideGUID, pos : Vector3) extends Action
   final case class DestroyDisplay(killer : SourceEntry, victim : SourceEntry, method : Int, unk : Int = 121) extends Action
   final case class DropItem(player_guid : PlanetSideGUID, item : Equipment, zone : Zone) extends Action
diff --git a/common/src/main/scala/services/avatar/AvatarServiceResponse.scala b/common/src/main/scala/services/avatar/AvatarServiceResponse.scala
index 215198428..7920703f6 100644
--- a/common/src/main/scala/services/avatar/AvatarServiceResponse.scala
+++ b/common/src/main/scala/services/avatar/AvatarServiceResponse.scala
@@ -6,7 +6,7 @@ import net.psforever.objects.ballistics.{Projectile, SourceEntry}
 import net.psforever.objects.equipment.Equipment
 import net.psforever.packet.PlanetSideGamePacket
 import net.psforever.packet.game.objectcreate.ConstructorData
-import net.psforever.packet.game.ObjectCreateMessage
+import net.psforever.packet.game.{ImplantAction, ObjectCreateMessage}
 import net.psforever.types.{ExoSuitType, PlanetSideEmpire, PlanetSideGUID, Vector3}
 import services.GenericEventBusMsg
 
@@ -26,6 +26,7 @@ object AvatarResponse {
   final case class ConcealPlayer() extends Response
   final case class EnvironmentalDamage(target : PlanetSideGUID, source_guid : PlanetSideGUID, amount : Int) extends Response
   final case class DeactivateImplantSlot(slot : Int) extends Response
+  final case class ActivateImplantSlot(slot : Int) extends Response
   final case class Destroy(victim : PlanetSideGUID, killer : PlanetSideGUID, weapon : PlanetSideGUID, pos : Vector3) extends Response
   final case class DestroyDisplay(killer : SourceEntry, victim : SourceEntry, method : Int, unk : Int) extends Response
   final case class DropItem(pkt : ObjectCreateMessage) extends Response
diff --git a/common/src/test/scala/objects/ImplantTest.scala b/common/src/test/scala/objects/ImplantTest.scala
index e7bc23900..337d563c3 100644
--- a/common/src/test/scala/objects/ImplantTest.scala
+++ b/common/src/test/scala/objects/ImplantTest.scala
@@ -2,31 +2,25 @@
 package objects
 
 import net.psforever.objects.ImplantSlot
-import net.psforever.objects.definition.{ImplantDefinition, Stance}
+import net.psforever.objects.definition.ImplantDefinition
 import net.psforever.types.{ExoSuitType, ImplantType}
 import org.specs2.mutable._
 
 class ImplantTest extends Specification {
   val sample = new ImplantDefinition(8) //variant of sensor shield/silent run
-      sample.Initialization = 90000 //1:30
-      sample.ActivationCharge = 3
-      sample.DurationChargeBase = 1
-      sample.DurationChargeByExoSuit += ExoSuitType.Agile -> 2
-      sample.DurationChargeByExoSuit += ExoSuitType.Reinforced -> 2
-      sample.DurationChargeByExoSuit += ExoSuitType.Standard -> 1
-      sample.DurationChargeByStance += Stance.Running -> 1
+      sample.InitializationDuration = 90000 //1:30
+      sample.ActivationStaminaCost = 3
+      sample.StaminaCost = 1
+      sample.CostIntervalDefault = 1000
+      sample.CostIntervalByExoSuitHashMap += ExoSuitType.Agile -> 500
 
   "ImplantDefinition" should {
     "define" in {
-      sample.Initialization mustEqual 90000
-      sample.ActivationCharge mustEqual 3
-      sample.DurationChargeBase mustEqual 1
-      sample.DurationChargeByExoSuit(ExoSuitType.Agile) mustEqual 2
-      sample.DurationChargeByExoSuit(ExoSuitType.Reinforced) mustEqual 2
-      sample.DurationChargeByExoSuit(ExoSuitType.Standard) mustEqual 1
-      sample.DurationChargeByExoSuit(ExoSuitType.Infiltration) mustEqual 0 //default value
-      sample.DurationChargeByStance(Stance.Running) mustEqual 1
-      sample.DurationChargeByStance(Stance.Crouching) mustEqual 0 //default value
+      sample.InitializationDuration mustEqual 90000
+      sample.ActivationStaminaCost mustEqual 3
+      sample.StaminaCost mustEqual 1
+      sample.GetCostIntervalByExoSuit(ExoSuitType.Reinforced) mustEqual 1000 // Default value
+      sample.GetCostIntervalByExoSuit(ExoSuitType.Agile) mustEqual 500 // Overridden value
       sample.Type mustEqual ImplantType.SilentRun
     }
   }
@@ -73,14 +67,14 @@ class ImplantTest extends Specification {
       obj.Unlocked mustEqual true
     }
 
-    "initialize without an implant" in {
+    "can not initialize without an implant" in {
       val obj = new ImplantSlot
       obj.Initialized mustEqual false
       obj.Initialized = true
       obj.Initialized mustEqual false
     }
 
-    "initialize an implant" in {
+    "can initialize an implant" in {
       val obj = new ImplantSlot
       obj.Initialized mustEqual false
 
@@ -90,7 +84,7 @@ class ImplantTest extends Specification {
       obj.Initialized mustEqual true
     }
 
-    "activate an uninitialized implant" in {
+    "can not activate an uninitialized implant" in {
       val obj = new ImplantSlot
       obj.Unlocked = true
       obj.Implant = sample
@@ -101,7 +95,7 @@ class ImplantTest extends Specification {
       obj.Active mustEqual false
     }
 
-    "activate an initialized implant" in {
+    "can activate an initialized implant" in {
       val obj = new ImplantSlot
       obj.Unlocked = true
       obj.Implant = sample
@@ -120,7 +114,7 @@ class ImplantTest extends Specification {
       obj.Initialized = true
       obj.Active mustEqual false
       obj.ActivationCharge mustEqual 0
-      obj.Charge(ExoSuitType.Reinforced, Stance.Running) mustEqual 0
+      obj.Charge(ExoSuitType.Reinforced) mustEqual 0
     }
 
     "cost energy while active" in {
@@ -131,7 +125,7 @@ class ImplantTest extends Specification {
       obj.Active = true
       obj.Active mustEqual true
       obj.ActivationCharge mustEqual 3
-      obj.Charge(ExoSuitType.Reinforced, Stance.Running) mustEqual 4
+      obj.Charge(ExoSuitType.Reinforced) mustEqual 1
     }
   }
 }
diff --git a/pslogin/src/main/scala/WorldSessionActor.scala b/pslogin/src/main/scala/WorldSessionActor.scala
index 513ded4d2..cdcd84b5f 100644
--- a/pslogin/src/main/scala/WorldSessionActor.scala
+++ b/pslogin/src/main/scala/WorldSessionActor.scala
@@ -162,11 +162,13 @@ class WorldSessionActor extends Actor
   var squadUpdateCounter : Int = 0
   val queuedSquadActions : Seq[() => Unit] = Seq(SquadUpdates, NoSquadUpdates, NoSquadUpdates, NoSquadUpdates)
 
-  var timeDL : Long = 0
-  var timeSurge : Long = 0
   lazy val unsignedIntMaxValue : Long = Int.MaxValue.toLong * 2L + 1L
   var serverTime : Long = 0
 
+  /** Keeps track of the number of PlayerStateMessageUpstream messages received by the client
+    * As they should arrive roughly every 250 milliseconds this allows for a very crude method of scheduling tasks up to four times per second */
+  private var playerStateMessageUpstreamCount = 0
+
   var amsSpawnPoints : List[SpawnPoint] = Nil
   var clientKeepAlive : Cancellable = DefaultCancellable.obj
   var progressBarUpdate : Cancellable = DefaultCancellable.obj
@@ -1301,8 +1303,26 @@ class WorldSessionActor extends Actor
       InitializeDeployableQuantities(avatar) //set deployables ui elements
       AwardBattleExperiencePoints(avatar, 20000000L)
       avatar.CEP = 600000
+                   avatar.Implants(0).Unlocked = true
+      avatar.Implants(0).Implant = GlobalDefinitions.darklight_vision
+      avatar.Implants(1).Unlocked = true
+      avatar.Implants(1).Implant = GlobalDefinitions.surge
+      avatar.Implants(2).Unlocked = true
+      avatar.Implants(2).Implant = GlobalDefinitions.targeting
 
       player = new Player(avatar)
+
+      (0 until DetailedCharacterData.numberOfImplantSlots(player.BEP)).foreach(slot => {
+        val implantSlot = player.ImplantSlot(slot)
+        if(implantSlot.Initialized) {
+          sendResponse(AvatarImplantMessage(player.GUID, ImplantAction.Initialization, slot, 1))
+        }
+        else {
+          player.Actor ! Player.ImplantInitializationStart(slot)
+        }
+        //TODO if this implant is Installed but does not have shortcut, add to a free slot or write over slot 61/62/63
+      })
+
       //xy-coordinates indicate sanctuary spawn bias:
       player.Position = math.abs(scala.util.Random.nextInt() % avatar.name.hashCode % 4) match {
         case 0 => Vector3(8192, 8192, 0) //NE
@@ -1534,12 +1554,10 @@ class WorldSessionActor extends Actor
         }
 
       case AvatarResponse.DeactivateImplantSlot(slot) =>
-        //temporary solution until implants are finalized
-        slot match {
-          case 1 => DeactivateImplantDarkLight()
-          case 2 => DeactivateImplantSurge()
-          case _ => ;
-        }
+        sendResponse(AvatarImplantMessage(PlanetSideGUID(player.GUID.guid), ImplantAction.Activation, slot, 0))
+
+      case AvatarResponse.ActivateImplantSlot(slot) =>
+        sendResponse(AvatarImplantMessage(PlanetSideGUID(player.GUID.guid), ImplantAction.Activation, slot, 1))
 
       case AvatarResponse.Destroy(victim, killer, weapon, pos) =>
         // guid = victim // killer = killer ;)
@@ -1572,8 +1590,6 @@ class WorldSessionActor extends Actor
         val respawnTimer = 300000 //milliseconds
         ToggleMaxSpecialState(enable = false)
         deadState = DeadState.Dead
-        timeDL = 0
-        timeSurge = 0
         continent.GUID(player.VehicleSeated) match {
           case Some(obj : Vehicle) =>
             TotalDriverVehicleControl(obj)
@@ -2587,6 +2603,7 @@ class WorldSessionActor extends Actor
           log.info(s"$message - put in slot $slot")
           sendResponse(AvatarImplantMessage(tplayer.GUID, ImplantAction.Add, slot, implant_type.id))
           sendResponse(ItemTransactionResultMessage(terminal_guid, TransactionType.Learn, true))
+          player.Actor ! Player.ImplantInitializationStart(slot)
         }
         else {
           if(interface.isEmpty) {
@@ -2620,6 +2637,7 @@ class WorldSessionActor extends Actor
         if(interface.contains(terminal_guid.guid) && slotNumber.isDefined) {
           val slot = slotNumber.get
           log.info(s"$tplayer is selling $implant_type - take from slot $slot")
+          player.Actor ! Player.UninitializeImplant(slot)
           sendResponse(AvatarImplantMessage(tplayer.GUID, ImplantAction.Remove, slot, 0))
           sendResponse(ItemTransactionResultMessage(terminal_guid, TransactionType.Sell, true))
         }
@@ -3358,8 +3376,13 @@ class WorldSessionActor extends Actor
       sendResponse(ChatMsg(ChatMessageType.CMT_TOGGLESPECTATORMODE, false, "", "on", None))
     }
     (0 until DetailedCharacterData.numberOfImplantSlots(tplayer.BEP)).foreach(slot => {
-      sendResponse(AvatarImplantMessage(guid, ImplantAction.Initialization, slot, 1)) //init implant slot
-      sendResponse(AvatarImplantMessage(guid, ImplantAction.Activation, slot, 0)) //deactivate implant
+      val implantSlot = player.ImplantSlot(slot)
+      if(implantSlot.Initialized) {
+        sendResponse(AvatarImplantMessage(guid, ImplantAction.Initialization, slot, 1))
+      }
+      else {
+        player.Actor ! Player.ImplantInitializationStart(slot)
+      }
       //TODO if this implant is Installed but does not have shortcut, add to a free slot or write over slot 61/62/63
     })
     sendResponse(PlanetsideAttributeMessage(PlanetSideGUID(0), 82, 0))
@@ -4011,70 +4034,20 @@ class WorldSessionActor extends Actor
       beginZoningSetCurrentAvatarFunc(player)
 
     case msg @ PlayerStateMessageUpstream(avatar_guid, pos, vel, yaw, pitch, yaw_upper, seq_time, unk3, is_crouching, is_jumping, jump_thrust, is_cloaking, unk5, unk6) =>
+      playerStateMessageUpstreamCount += 1
       val isMoving = WorldEntity.isMoving(vel)
       val isMovingPlus = isMoving || is_jumping || jump_thrust
-      //implants and stamina management start
-      val implantsAreActive = avatar.Implants(0).Active || avatar.Implants(1).Active
-      val staminaBefore = player.Stamina
-      val hadStaminaBefore = staminaBefore > 0
-      val hasStaminaAfter = if(deadState == DeadState.Alive) {
-        if(implantsAreActive && hadStaminaBefore) {
-          val time = System.currentTimeMillis()
-          if(timeDL != 0) {
-            val duration = time - timeDL
-            if(duration > 500) {
-              val units = (duration / 500).toInt
-              player.Stamina = player.Stamina - units
-              timeDL += units * 500
-            }
-          }
-          if(timeSurge != 0) {
-            val duration = time - timeSurge
-            val period = player.ExoSuit match {
-              case ExoSuitType.Agile => 500
-              case ExoSuitType.Reinforced => 333
-              case ExoSuitType.Infiltration => 1000
-              case ExoSuitType.Standard => 1000
-              case _ => 1
-            }
-            if(duration > period) {
-              val units = (duration / period).toInt
-              player.Stamina = player.Stamina - units
-              timeSurge += period * units
-            }
-          }
-        }
+
+      if(deadState == DeadState.Alive && playerStateMessageUpstreamCount % 2 == 0) { // Regen stamina roughly every 500ms
         if(player.skipStaminaRegenForTurns > 0) {
           //do not renew stamina for a while
           player.skipStaminaRegenForTurns -= 1
-          player.Stamina > 0
         }
-        else if(player.Stamina == 0 && hadStaminaBefore) {
-          //if the player lost all stamina this turn (had stamina at the start), do not renew stamina for a while
-          player.skipStaminaRegenForTurns = 4
-          player.Stamina > 0
-        }
-        else if(isMovingPlus || player.Stamina == player.MaxStamina) {
-          //ineligible for stamina regen
-          player.Stamina > 0
-        }
-        else {
-          player.Stamina = player.Stamina + 1
-          true
+        else if(!isMovingPlus && player.Stamina != player.MaxStamina) {
+          player.Stamina += 1
         }
       }
-      else {
-        timeDL = 0
-        timeSurge = 0
-        false
-      }
-      if(staminaBefore != player.Stamina) { //stamina changed
-        sendResponse(PlanetsideAttributeMessage(player.GUID, 2, player.Stamina))
-      }
-      if(implantsAreActive && !hasStaminaAfter) { //implants deactivated at 0 stamina
-        DeactivateImplants()
-      }
-      //implants and stamina management finish
+
       player.Position = pos
       player.Velocity = vel
       player.Orientation = Vector3(player.Orientation.x, pitch, yaw)
@@ -4667,7 +4640,6 @@ class WorldSessionActor extends Actor
       //log.info("AvatarJump: " + msg)
       player.Stamina = player.Stamina - 10
       player.skipStaminaRegenForTurns = math.max(player.skipStaminaRegenForTurns, 5)
-      sendResponse(PlanetsideAttributeMessage(player.GUID, 2, player.Stamina))
 
     case msg @ ZipLineMessage(player_guid,forwards,action,path_id,pos) =>
       log.info("ZipLineMessage: " + msg)
@@ -4882,25 +4854,10 @@ class WorldSessionActor extends Actor
           log.warn(s"LootItem: can not find where to put $item_guid")
       }
 
-    case msg @ AvatarImplantMessage(_, action, slot, status) => //(player_guid, unk1, unk2, implant) =>
+    case msg @ AvatarImplantMessage(player_guid, action, slot, status) =>
       log.info("AvatarImplantMessage: " + msg)
-      if (avatar.Implants(slot).Initialized) {
-        if(action == ImplantAction.Activation && status == 1) { // active
-          avatar.Implants(slot).Active = true
-          continent.AvatarEvents ! AvatarServiceMessage(continent.Id, AvatarAction.PlanetsideAttribute(player.GUID, 28, avatar.Implant(slot).id * 2 + 1))
-          if (avatar.Implant(slot).id == 3) {
-            timeDL = System.currentTimeMillis()
-            player.Stamina = player.Stamina - 3
-            sendResponse(PlanetsideAttributeMessage(player.GUID, 2, player.Stamina))
-          }
-          if (avatar.Implant(slot).id == 9) timeSurge = System.currentTimeMillis()
-        } else if(action == ImplantAction.Activation && status == 0) { //desactive
-          avatar.Implants(slot).Active = false
-          continent.AvatarEvents ! AvatarServiceMessage(continent.Id, AvatarAction.PlanetsideAttribute(player.GUID, 28, avatar.Implant(slot).id * 2))
-          if (avatar.Implant(slot).id == 3) timeDL = 0
-          if (avatar.Implant(slot).id == 9) timeSurge = 0
-        }
-        sendResponse(AvatarImplantMessage(PlanetSideGUID(player.GUID.guid),action,slot,status))
+      if(action == ImplantAction.Activation) {
+        player.Actor ! Player.ImplantActivation(slot, status)
       }
 
     case msg @ UseItemMessage(avatar_guid, item_used_guid, object_guid, unk2, unk3, unk4, unk5, unk6, unk7, unk8, itemType) =>
@@ -5073,7 +5030,6 @@ class WorldSessionActor extends Actor
                             sendResponse(ObjectDeleteMessage(kit.GUID, 0))
                             taskResolver ! GUIDTask.UnregisterEquipment(kit)(continent.GUID)
                             player.Stamina = player.Stamina + 100
-                            sendResponse(PlanetsideAttributeMessage(avatar_guid, 2, player.Stamina))
                           case None =>
                             log.error(s"UseItem: anticipated a $kit, but can't find it")
                         }
@@ -5652,7 +5608,6 @@ class WorldSessionActor extends Actor
           else { //shooting
             if (tool.FireModeIndex == 1 && (tool.Definition.Name == "anniversary_guna" || tool.Definition.Name == "anniversary_gun" || tool.Definition.Name == "anniversary_gunb")) {
               player.Stamina = 0
-              sendResponse(PlanetsideAttributeMessage(player.GUID, 2, 0))
             }
 
             prefire = shooting.orElse(Some(weapon_guid))
@@ -8292,6 +8247,7 @@ class WorldSessionActor extends Actor
   def RespawnClone(tplayer : Player) : Player = {
     val faction = tplayer.Faction
     val obj = Player.Respawn(tplayer)
+    obj.ResetAllImplants()
     LoadClassicDefault(obj)
     obj
   }
@@ -11066,39 +11022,9 @@ class WorldSessionActor extends Actor
     projectilesToCleanUp(local_index) = false
   }
 
-  /**
-    * Deactivate all active implants.
-    * This method is intended to support only the current Live server implants that are functional,
-    * the darklight vision implant and the surge implant.
-    */
   def DeactivateImplants() : Unit = {
-    DeactivateImplantDarkLight()
-    DeactivateImplantSurge()
-  }
-
-  /**
-    * Deactivate the darklight vision implant.
-    * This method is intended to support only the current Live server implants.
-    */
-  def DeactivateImplantDarkLight() : Unit = {
-    if(avatar.Implants(0).Active && avatar.Implants(0).Implant == ImplantType.DarklightVision) {
-      avatar.Implants(0).Active = false
-      continent.AvatarEvents ! AvatarServiceMessage(continent.Id, AvatarAction.PlanetsideAttribute(player.GUID, 28, avatar.Implant(0).id * 2))
-      sendResponse(AvatarImplantMessage(PlanetSideGUID(player.GUID.guid), ImplantAction.Activation, 0, 0))
-      timeDL = 0
-    }
-  }
-
-  /**
-    * Deactivate the surge implant.
-    * This method is intended to support only the current Live server implants.
-    */
-  def DeactivateImplantSurge() : Unit = {
-    if(avatar.Implants(1).Active && avatar.Implants(0).Implant == ImplantType.Surge) {
-      avatar.Implants(1).Active = false
-      continent.AvatarEvents  ! AvatarServiceMessage(continent.Id, AvatarAction.PlanetsideAttribute(player.GUID, 28, avatar.Implant(1).id * 2))
-      sendResponse(AvatarImplantMessage(PlanetSideGUID(player.GUID.guid), ImplantAction.Activation, 1, 0))
-      timeSurge = 0
+    for(slot <- 0 to player.Implants.length - 1) {
+      player.Actor ! Player.ImplantActivation(slot, 0)
     }
   }