diff --git a/src/main/java/li/cil/oc/api/API.java b/src/main/java/li/cil/oc/api/API.java
index c0981dc2b..eb7f7c73f 100644
--- a/src/main/java/li/cil/oc/api/API.java
+++ b/src/main/java/li/cil/oc/api/API.java
@@ -16,7 +16,7 @@ import li.cil.oc.api.detail.NetworkAPI;
  */
 public class API {
     public static final String ID_OWNER = "OpenComputers|Core";
-    public static final String VERSION = "5.2.1";
+    public static final String VERSION = "5.2.2";
 
     public static DriverAPI driver = null;
     public static FileSystemAPI fileSystem = null;
diff --git a/src/main/java/li/cil/oc/api/driver/item/Chargeable.java b/src/main/java/li/cil/oc/api/driver/item/Chargeable.java
new file mode 100644
index 000000000..12340b734
--- /dev/null
+++ b/src/main/java/li/cil/oc/api/driver/item/Chargeable.java
@@ -0,0 +1,34 @@
+package li.cil.oc.api.driver.item;
+
+import net.minecraft.item.ItemStack;
+
+/**
+ * This interface can be implemented on items that go into a charger.
+ * <p/>
+ * This provides a generic way of charging items, even such that are not
+ * components. Doing it this way enables items to provide another environment,
+ * that is unrelated to charging, such as tablets providing their file system,
+ * while in the charger.
+ */
+public interface Chargeable {
+    /**
+     * Whether the specified item stack can be charged.
+     * <p/>
+     * This is primarily meant to filter meta item subitems that are not meant
+     * to be chargeable.
+     *
+     * @param stack the stack to check for.
+     * @return whether the specified item stack is chargeable.
+     */
+    boolean canCharge(ItemStack stack);
+
+    /**
+     * Called when checking if an item can be charged or should be charged.
+     *
+     * @param stack    the item to charge.
+     * @param amount   the amount to inject into the item.
+     * @param simulate whether to only simulate injection.
+     * @return the remainder of the energy that could not be injected.
+     */
+    double charge(ItemStack stack, double amount, boolean simulate);
+}
diff --git a/src/main/scala/li/cil/oc/common/IMC.scala b/src/main/scala/li/cil/oc/common/IMC.scala
index 4b19d26c3..9b8a3c445 100644
--- a/src/main/scala/li/cil/oc/common/IMC.scala
+++ b/src/main/scala/li/cil/oc/common/IMC.scala
@@ -8,6 +8,7 @@ import li.cil.oc.OpenComputers
 import li.cil.oc.Settings
 import li.cil.oc.common.template.AssemblerTemplates
 import li.cil.oc.common.template.DisassemblerTemplates
+import li.cil.oc.integration.util.ItemCharge
 import li.cil.oc.integration.util.Wrench
 import li.cil.oc.server.driver.Registry
 import net.minecraft.entity.player.EntityPlayer
@@ -57,6 +58,15 @@ object IMC {
           case t: Throwable => OpenComputers.log.warn("Failed registering wrench tool.", t)
         }
       }
+      else if (message.key == "registerItemCharge" && message.isNBTMessage) {
+        OpenComputers.log.info(s"Registering new item charge implementation '${message.getNBTValue.getString("name")}' from mod ${message.getSender}.")
+        try ItemCharge.add(
+          getStaticMethod(message.getNBTValue.getString("canCharge"), classOf[ItemStack]),
+          getStaticMethod(message.getNBTValue.getString("charge"), classOf[ItemStack], classOf[Double], classOf[Boolean])
+        ) catch {
+          case t: Throwable => OpenComputers.log.warn("Failed registering item charge implementation.", t)
+        }
+      }
       else if (message.key == "blacklistPeripheral" && message.isStringMessage) {
         OpenComputers.log.info(s"Blacklisting CC peripheral '${message.getStringValue}' as requested by mod ${message.getSender}.")
         if (!Settings.get.peripheralBlacklist.contains(message.getStringValue)) {
diff --git a/src/main/scala/li/cil/oc/common/init/Items.scala b/src/main/scala/li/cil/oc/common/init/Items.scala
index 78be08e56..d6fbed2e7 100644
--- a/src/main/scala/li/cil/oc/common/init/Items.scala
+++ b/src/main/scala/li/cil/oc/common/init/Items.scala
@@ -247,9 +247,9 @@ object Items extends ItemAPI {
       Option(get(Constants.ItemName.RAMTier6).createItemStack(1)),
 
       Option(createLuaBios()),
-      Option(createOpenOS()),
       Option(get(Constants.ItemName.HDDTier3).createItemStack(1))
-    )
+    ).padTo(32, None)
+    data.items(31) = Option(createOpenOS())
     data.container = Option(get(Constants.BlockName.DiskDrive).createItemStack(1))
 
     val stack = get(Constants.ItemName.Tablet).createItemStack(1)
diff --git a/src/main/scala/li/cil/oc/common/inventory/ComponentInventory.scala b/src/main/scala/li/cil/oc/common/inventory/ComponentInventory.scala
index fad585fc6..2f17d5021 100644
--- a/src/main/scala/li/cil/oc/common/inventory/ComponentInventory.scala
+++ b/src/main/scala/li/cil/oc/common/inventory/ComponentInventory.scala
@@ -38,7 +38,7 @@ trait ComponentInventory extends Inventory with network.Environment {
   def connectComponents() {
     for (slot <- 0 until getSizeInventory if slot >= 0 && slot < components.length) {
       val stack = getStackInSlot(slot)
-      if (stack != null && components(slot).isEmpty && isComponentSlot(slot)) {
+      if (stack != null && components(slot).isEmpty && isComponentSlot(slot, stack)) {
         components(slot) = Option(Driver.driverFor(stack)) match {
           case Some(driver) =>
             Option(driver.createEnvironment(stack, host)) match {
@@ -98,7 +98,7 @@ trait ComponentInventory extends Inventory with network.Environment {
 
   override def getInventoryStackLimit = 1
 
-  override protected def onItemAdded(slot: Int, stack: ItemStack) = if (isComponentSlot(slot)) {
+  override protected def onItemAdded(slot: Int, stack: ItemStack) = if (isComponentSlot(slot, stack)) {
     Option(Driver.driverFor(stack)).foreach(driver =>
       Option(driver.createEnvironment(stack, host)) match {
         case Some(component) => this.synchronized {
@@ -140,7 +140,7 @@ trait ComponentInventory extends Inventory with network.Environment {
     }
   }
 
-  def isComponentSlot(slot: Int) = true
+  def isComponentSlot(slot: Int, stack: ItemStack) = true
 
   protected def connectItemNode(node: Node) {
     if (this.node != null && node != null) {
diff --git a/src/main/scala/li/cil/oc/common/item/Delegator.scala b/src/main/scala/li/cil/oc/common/item/Delegator.scala
index 4677a5fb2..37c62025b 100644
--- a/src/main/scala/li/cil/oc/common/item/Delegator.scala
+++ b/src/main/scala/li/cil/oc/common/item/Delegator.scala
@@ -6,6 +6,7 @@ import java.util.Random
 import li.cil.oc.CreativeTab
 import li.cil.oc.OpenComputers
 import li.cil.oc.api.driver
+import li.cil.oc.api.driver.item.Chargeable
 import li.cil.oc.api.event.RobotRenderEvent.MountPoint
 import li.cil.oc.api.internal.Robot
 import li.cil.oc.client.renderer.item.UpgradeRenderer
@@ -38,7 +39,7 @@ object Delegator {
     else None
 }
 
-class Delegator extends Item with driver.item.UpgradeRenderer {
+class Delegator extends Item with driver.item.UpgradeRenderer with Chargeable {
   setHasSubtypes(true)
   setCreativeTab(CreativeTab)
 
@@ -217,6 +218,20 @@ class Delegator extends Item with driver.item.UpgradeRenderer {
 
   // ----------------------------------------------------------------------- //
 
+  def canCharge(stack: ItemStack): Boolean =
+    Delegator.subItem(stack) match {
+      case Some(subItem: Chargeable) => true
+      case _ => false
+    }
+
+  def charge(stack: ItemStack, amount: Double, simulate: Boolean): Double =
+    Delegator.subItem(stack) match {
+      case Some(subItem: Chargeable) => subItem.charge(stack, amount, simulate)
+      case _ => 0.0
+    }
+
+  // ----------------------------------------------------------------------- //
+
   override def computePreferredMountPoint(stack: ItemStack, robot: Robot, availableMountPoints: util.Set[String]): String = UpgradeRenderer.preferredMountPoint(stack, availableMountPoints)
 
   override def render(stack: ItemStack, mountPoint: MountPoint, robot: Robot, pt: Float): Unit = UpgradeRenderer.render(stack, mountPoint)
diff --git a/src/main/scala/li/cil/oc/common/item/Tablet.scala b/src/main/scala/li/cil/oc/common/item/Tablet.scala
index 31a3a488d..4bf15183f 100644
--- a/src/main/scala/li/cil/oc/common/item/Tablet.scala
+++ b/src/main/scala/li/cil/oc/common/item/Tablet.scala
@@ -16,6 +16,7 @@ import li.cil.oc.Settings
 import li.cil.oc.api
 import li.cil.oc.api.Driver
 import li.cil.oc.api.Machine
+import li.cil.oc.api.driver.item.Chargeable
 import li.cil.oc.api.driver.item.Container
 import li.cil.oc.api.internal
 import li.cil.oc.api.machine.MachineHost
@@ -53,7 +54,7 @@ import net.minecraftforge.fml.relauncher.SideOnly
 import scala.collection.convert.WrapAsJava._
 import scala.collection.convert.WrapAsScala._
 
-class Tablet(val parent: Delegator) extends Delegate with CustomModel {
+class Tablet(val parent: Delegator) extends Delegate with CustomModel with Chargeable {
   final val TimeToAnalyze = 10
 
   // Must be assembled to be usable so we hide it in the item list.
@@ -120,6 +121,20 @@ class Tablet(val parent: Delegator) extends Delegate with CustomModel {
     }
   }
 
+  def canCharge(stack: ItemStack): Boolean = true
+
+  def charge(stack: ItemStack, amount: Double, simulate: Boolean): Double = {
+    val data = new TabletData(stack)
+    val charge = math.min(data.maxEnergy - data.energy, amount)
+    if (!simulate) {
+      data.energy += charge
+      data.save(stack)
+    }
+    amount - charge
+  }
+
+  // ----------------------------------------------------------------------- //
+
   override def update(stack: ItemStack, world: World, entity: Entity, slot: Int, selected: Boolean) =
     entity match {
       case player: EntityPlayer =>
@@ -344,7 +359,7 @@ class TabletWrapper(var stack: ItemStack, var player: EntityPlayer) extends Comp
     })
 
   override def internalComponents(): Iterable[ItemStack] = (0 until getSizeInventory).collect {
-    case slot if isComponentSlot(slot) && getStackInSlot(slot) != null => getStackInSlot(slot)
+    case slot if getStackInSlot(slot) != null && isComponentSlot(slot, getStackInSlot(slot)) => getStackInSlot(slot)
   }
 
   override def componentSlot(address: String) = components.indexWhere(_.exists(env => env.node != null && env.node.address == address))
diff --git a/src/main/scala/li/cil/oc/common/item/UpgradeBattery.scala b/src/main/scala/li/cil/oc/common/item/UpgradeBattery.scala
index b93a97344..482047117 100644
--- a/src/main/scala/li/cil/oc/common/item/UpgradeBattery.scala
+++ b/src/main/scala/li/cil/oc/common/item/UpgradeBattery.scala
@@ -1,9 +1,11 @@
 package li.cil.oc.common.item
 
 import li.cil.oc.Settings
+import li.cil.oc.api.driver.item.Chargeable
+import li.cil.oc.common.item.data.NodeData
 import net.minecraft.item.ItemStack
 
-class UpgradeBattery(val parent: Delegator, val tier: Int) extends Delegate with ItemTier {
+class UpgradeBattery(val parent: Delegator, val tier: Int) extends Delegate with ItemTier with Chargeable {
   override val unlocalizedName = super.unlocalizedName + tier
 
   override protected def tooltipName = Option(super.unlocalizedName)
@@ -13,10 +15,25 @@ class UpgradeBattery(val parent: Delegator, val tier: Int) extends Delegate with
   override def showDurabilityBar(stack: ItemStack) = true
 
   override def durability(stack: ItemStack) = {
-    if (stack.hasTagCompound) {
-      val stored = stack.getTagCompound.getCompoundTag(Settings.namespace + "data").getCompoundTag("node").getDouble("buffer")
-      1 - stored / Settings.get.bufferCapacitorUpgrades(tier)
+    val data = new NodeData(stack)
+    1 - data.buffer.getOrElse(0.0) / Settings.get.bufferCapacitorUpgrades(tier)
+  }
+
+  // ----------------------------------------------------------------------- //
+
+  def canCharge(stack: ItemStack): Boolean = true
+
+  def charge(stack: ItemStack, amount: Double, simulate: Boolean): Double = {
+    val data = new NodeData(stack)
+    val buffer = data.buffer match {
+      case Some(value) => value
+      case _ => 0.0
     }
-    else 1.0
+    val charge = math.min(amount, Settings.get.bufferCapacitorUpgrades(tier).toInt - buffer)
+    if (!simulate) {
+      data.buffer = Option(buffer + charge)
+      data.save(stack)
+    }
+    amount - charge
   }
 }
diff --git a/src/main/scala/li/cil/oc/common/item/data/NodeData.scala b/src/main/scala/li/cil/oc/common/item/data/NodeData.scala
new file mode 100644
index 000000000..ee477a655
--- /dev/null
+++ b/src/main/scala/li/cil/oc/common/item/data/NodeData.scala
@@ -0,0 +1,45 @@
+package li.cil.oc.common.item.data
+
+import li.cil.oc.Settings
+import li.cil.oc.api.network.Visibility
+import net.minecraft.item.ItemStack
+import net.minecraft.nbt.NBTTagCompound
+
+// Generic one for items that are used as components; gets the items node info.
+class NodeData extends ItemData {
+  def this(stack: ItemStack) {
+    this()
+    load(stack)
+  }
+
+  var address: Option[String] = None
+  var buffer: Option[Double] = None
+  var visibility: Option[Visibility] = None
+
+  override def load(nbt: NBTTagCompound): Unit = {
+    val nodeNbt = nbt.getCompoundTag(Settings.namespace + "data").getCompoundTag("node")
+    if (nodeNbt.hasKey("address")) {
+      address = Option(nodeNbt.getString("address"))
+    }
+    if (nodeNbt.hasKey("buffer")) {
+      buffer = Option(nodeNbt.getDouble("buffer"))
+    }
+    if (nodeNbt.hasKey("visibility")) {
+      visibility = Option(Visibility.values()(nodeNbt.getInteger("visibility")))
+    }
+  }
+
+  override def save(nbt: NBTTagCompound): Unit = {
+    if (!nbt.hasKey(Settings.namespace + "data")) {
+      nbt.setTag(Settings.namespace + "data", new NBTTagCompound())
+    }
+    val dataNbt = nbt.getCompoundTag(Settings.namespace + "data")
+    if (!dataNbt.hasKey("node")) {
+      dataNbt.setTag("node", new NBTTagCompound())
+    }
+    val nodeNbt = dataNbt.getCompoundTag("node")
+    address.foreach(nodeNbt.setString("address", _))
+    buffer.foreach(nodeNbt.setDouble("buffer", _))
+    visibility.map(_.ordinal()).foreach(nodeNbt.setInteger("visibility", _))
+  }
+}
diff --git a/src/main/scala/li/cil/oc/common/tileentity/Charger.scala b/src/main/scala/li/cil/oc/common/tileentity/Charger.scala
index a50e96a04..c94aadc58 100644
--- a/src/main/scala/li/cil/oc/common/tileentity/Charger.scala
+++ b/src/main/scala/li/cil/oc/common/tileentity/Charger.scala
@@ -9,8 +9,7 @@ import li.cil.oc.api.Driver
 import li.cil.oc.api.network._
 import li.cil.oc.common.Slot
 import li.cil.oc.common.entity.Drone
-import li.cil.oc.common.item.Tablet
-import li.cil.oc.common.item.data.TabletData
+import li.cil.oc.integration.util.ItemCharge
 import li.cil.oc.server.{PacketSender => ServerPacketSender}
 import li.cil.oc.util.BlockPosition
 import li.cil.oc.util.ExtendedWorld._
@@ -75,8 +74,32 @@ class Charger extends traits.Environment with traits.PowerAcceptor with traits.R
     }
 
     if (isServer && world.getWorldInfo.getWorldTotalTime % Settings.get.tickFrequency == 0) {
-      val charge = Settings.get.chargeRateExternal * chargeSpeed * Settings.get.tickFrequency
-      val canCharge = charge > 0 && (node.globalBuffer >= charge * 0.5 || Settings.get.ignorePower)
+      var canCharge = Settings.get.ignorePower
+
+      // Charging of external devices.
+      {
+        val charge = Settings.get.chargeRateExternal * chargeSpeed * Settings.get.tickFrequency
+        canCharge ||= charge > 0 && node.globalBuffer >= charge * 0.5
+        if (canCharge) {
+          connectors.foreach {
+            case (_, connector) => node.changeBuffer(connector.changeBuffer(charge + node.changeBuffer(-charge)))
+          }
+        }
+      }
+
+      // Charging of internal devices.
+      {
+        val charge = Settings.get.chargeRateTablet * chargeSpeed * Settings.get.tickFrequency
+        canCharge ||= charge > 0 && node.globalBuffer >= charge * 0.5
+        if (canCharge) {
+          (0 until getSizeInventory).map(getStackInSlot).foreach(stack => if (stack != null) {
+            val offered = charge + node.changeBuffer(-charge)
+            val surplus = ItemCharge.charge(stack, offered)
+            node.changeBuffer(surplus)
+          })
+        }
+      }
+
       if (hasPower && !canCharge) {
         hasPower = false
         ServerPacketSender.sendChargerState(this)
@@ -85,28 +108,6 @@ class Charger extends traits.Environment with traits.PowerAcceptor with traits.R
         hasPower = true
         ServerPacketSender.sendChargerState(this)
       }
-      if (canCharge) {
-        connectors.foreach {
-          case (_, connector) => node.changeBuffer(connector.changeBuffer(charge + node.changeBuffer(-charge)))
-        }
-      }
-
-      // Charge tablet if present.
-      val stack = getStackInSlot(0)
-      if (stack != null && chargeSpeed > 0) {
-        def tryCharge(energy: Double, maxEnergy: Double, handler: (Double) => Unit) {
-          if (energy < maxEnergy) {
-            val itemCharge = math.min(maxEnergy - energy, Settings.get.chargeRateTablet * chargeSpeed * Settings.get.tickFrequency)
-            if (node.tryChangeBuffer(-itemCharge))
-              handler(itemCharge)
-          }
-        }
-        val data = new TabletData(stack)
-        tryCharge(data.energy, data.maxEnergy, (amount) => {
-          data.energy = math.min(data.maxEnergy, data.energy + amount)
-          data.save(stack)
-        })
-      }
     }
 
     if (isClient && chargeSpeed > 0 && hasPower && world.getWorldInfo.getWorldTotalTime % 10 == 0) {
@@ -160,22 +161,17 @@ class Charger extends traits.Environment with traits.PowerAcceptor with traits.R
 
   // ----------------------------------------------------------------------- //
 
+  override def isComponentSlot(slot: Int, stack: ItemStack): Boolean =
+    super.isComponentSlot(slot, stack) && (Option(Driver.driverFor(stack, getClass)) match {
+      case Some(driver) => driver.slot(stack) == Slot.Tablet
+      case _ => false
+    })
+
   override def getSizeInventory = 1
 
   override def isItemValidForSlot(slot: Int, stack: ItemStack) = (slot, Option(Driver.driverFor(stack, getClass))) match {
-    case (0, Some(driver)) => driver.slot(stack) == Slot.Tablet
-    case _ => false
-  }
-
-  override protected def onItemAdded(slot: Int, stack: ItemStack) {
-    super.onItemAdded(slot, stack)
-    Tablet.Server.cache.invalidate(Tablet.getId(stack))
-    components(slot) match {
-      case Some(environment) => environment.node match {
-        case component: Component => component.setVisibility(Visibility.Network)
-      }
-      case _ =>
-    }
+    case (0, Some(driver)) if driver.slot(stack) == Slot.Tablet => true
+    case _ => ItemCharge.canCharge(stack)
   }
 
   // ----------------------------------------------------------------------- //
diff --git a/src/main/scala/li/cil/oc/common/tileentity/Robot.scala b/src/main/scala/li/cil/oc/common/tileentity/Robot.scala
index 07af42b97..f4c20cb1e 100644
--- a/src/main/scala/li/cil/oc/common/tileentity/Robot.scala
+++ b/src/main/scala/li/cil/oc/common/tileentity/Robot.scala
@@ -594,7 +594,7 @@ class Robot extends traits.Computer with traits.PowerInformation with traits.Rot
       if (isFloppySlot(slot)) {
         common.Sound.playDiskInsert(this)
       }
-      if (isComponentSlot(slot)) {
+      if (isComponentSlot(slot, stack)) {
         super.onItemAdded(slot, stack)
         world.notifyBlocksOfNeighborChange(position, getBlockType)
       }
@@ -620,7 +620,7 @@ class Robot extends traits.Computer with traits.PowerInformation with traits.Rot
       if (isInventorySlot(slot)) {
         machine.signal("inventory_changed", Int.box(slot - equipmentInventory.getSizeInventory + 1))
       }
-      if (isComponentSlot(slot)) {
+      if (isComponentSlot(slot, stack)) {
         world.notifyBlocksOfNeighborChange(position, getBlockType)
       }
     }
@@ -666,7 +666,7 @@ class Robot extends traits.Computer with traits.PowerInformation with traits.Rot
     }
   }
 
-  override def isComponentSlot(slot: Int) = (containerSlots ++ componentSlots) contains slot
+  override def isComponentSlot(slot: Int, stack: ItemStack) = (containerSlots ++ componentSlots) contains slot
 
   def containerSlotType(slot: Int) = if (containerSlots contains slot) {
     val stack = info.containers(slot - 1)
@@ -692,13 +692,13 @@ class Robot extends traits.Computer with traits.PowerInformation with traits.Rot
 
   def isInventorySlot(slot: Int) = inventorySlots contains slot
 
-  def isFloppySlot(slot: Int) = isComponentSlot(slot) && (Option(getStackInSlot(slot)) match {
-    case Some(stack) => Option(Driver.driverFor(stack, getClass)) match {
+  def isFloppySlot(slot: Int) = getStackInSlot(slot) != null && isComponentSlot(slot, getStackInSlot(slot)) && {
+    val stack = getStackInSlot(slot)
+    Option(Driver.driverFor(stack, getClass)) match {
       case Some(driver) => driver.slot(stack) == Slot.Floppy
       case _ => false
     }
-    case _ => false
-  })
+  }
 
   def isUpgradeSlot(slot: Int) = containerSlotType(slot) == Slot.Upgrade
 
@@ -766,7 +766,7 @@ class Robot extends traits.Computer with traits.PowerInformation with traits.Rot
 
   override def setInventorySlotContents(slot: Int, stack: ItemStack) {
     if (slot < getSizeInventory - componentCount && (isItemValidForSlot(slot, stack) || stack == null)) {
-      if (stack != null && stack.stackSize > 1 && isComponentSlot(slot)) {
+      if (stack != null && stack.stackSize > 1 && isComponentSlot(slot, stack)) {
         super.setInventorySlotContents(slot, stack.splitStack(1))
         if (stack.stackSize > 0 && isServer) {
           player().inventory.addItemStackToInventory(stack)
@@ -886,5 +886,5 @@ class Robot extends traits.Computer with traits.PowerInformation with traits.Rot
   override def getTankInfo(from: EnumFacing) =
     components.collect {
       case Some(t: IFluidTank) => t.getInfo
-    }.toArray
+    }
 }
diff --git a/src/main/scala/li/cil/oc/common/tileentity/traits/ComponentInventory.scala b/src/main/scala/li/cil/oc/common/tileentity/traits/ComponentInventory.scala
index e2e13ca98..50afc5648 100644
--- a/src/main/scala/li/cil/oc/common/tileentity/traits/ComponentInventory.scala
+++ b/src/main/scala/li/cil/oc/common/tileentity/traits/ComponentInventory.scala
@@ -2,6 +2,7 @@ package li.cil.oc.common.tileentity.traits
 
 import li.cil.oc.api.network.Node
 import li.cil.oc.common.inventory
+import net.minecraft.item.ItemStack
 import net.minecraft.nbt.NBTTagCompound
 import net.minecraftforge.fml.relauncher.Side
 import net.minecraftforge.fml.relauncher.SideOnly
@@ -9,7 +10,7 @@ import net.minecraftforge.fml.relauncher.SideOnly
 trait ComponentInventory extends Environment with Inventory with inventory.ComponentInventory {
   override def host = this
 
-  override def isComponentSlot(slot: Int) = isServer
+  override def isComponentSlot(slot: Int, stack: ItemStack) = isServer
 
   override def onConnect(node: Node) {
     super.onConnect(node)
diff --git a/src/main/scala/li/cil/oc/common/tileentity/traits/Computer.scala b/src/main/scala/li/cil/oc/common/tileentity/traits/Computer.scala
index 24d0051ad..129e5fe73 100644
--- a/src/main/scala/li/cil/oc/common/tileentity/traits/Computer.scala
+++ b/src/main/scala/li/cil/oc/common/tileentity/traits/Computer.scala
@@ -73,7 +73,7 @@ trait Computer extends Environment with ComponentInventory with Rotatable with B
   // ----------------------------------------------------------------------- //
 
   override def internalComponents(): lang.Iterable[ItemStack] = (0 until getSizeInventory).collect {
-    case i if isComponentSlot(i) && getStackInSlot(i) != null => getStackInSlot(i)
+    case slot if getStackInSlot(slot) != null && isComponentSlot(slot, getStackInSlot(slot)) => getStackInSlot(slot)
   }
 
 
diff --git a/src/main/scala/li/cil/oc/integration/cofh/energy/EventHandlerRedstoneFlux.scala b/src/main/scala/li/cil/oc/integration/cofh/energy/EventHandlerRedstoneFlux.scala
index 6f12a5611..8d1af1fa8 100644
--- a/src/main/scala/li/cil/oc/integration/cofh/energy/EventHandlerRedstoneFlux.scala
+++ b/src/main/scala/li/cil/oc/integration/cofh/energy/EventHandlerRedstoneFlux.scala
@@ -1,5 +1,6 @@
 package li.cil.oc.integration.cofh.energy
 
+import li.cil.oc.Settings
 import li.cil.oc.api.event.RobotUsedToolEvent
 import net.minecraft.item.ItemStack
 
@@ -28,4 +29,16 @@ object EventHandlerRedstoneFlux {
       case _ => Double.NaN
     }
   }
+
+  def canCharge(stack: ItemStack): Boolean = stack.getItem match {
+    case chargeable: IEnergyContainerItem => chargeable.getMaxEnergyStored(stack) > 0
+    case _ => false
+  }
+
+  def charge(stack: ItemStack, amount: Double, simulate: Boolean): Double = {
+    stack.getItem match {
+      case item: IEnergyContainerItem => amount - item.receiveEnergy(stack, (amount * Settings.get.ratioRedstoneFlux).toInt, simulate) / Settings.get.ratioRedstoneFlux
+      case _ => amount
+    }
+  }
 }
diff --git a/src/main/scala/li/cil/oc/integration/cofh/energy/ModCoFHEnergy.scala b/src/main/scala/li/cil/oc/integration/cofh/energy/ModCoFHEnergy.scala
index c10ebae1a..5ccfe31f4 100644
--- a/src/main/scala/li/cil/oc/integration/cofh/energy/ModCoFHEnergy.scala
+++ b/src/main/scala/li/cil/oc/integration/cofh/energy/ModCoFHEnergy.scala
@@ -6,6 +6,7 @@ import cpw.mods.fml.common.versioning.VersionRange
 import li.cil.oc.api.Driver
 import li.cil.oc.integration.ModProxy
 import li.cil.oc.integration.Mods
+import net.minecraft.nbt.NBTTagCompound
 import net.minecraftforge.common.MinecraftForge
 
 import scala.collection.convert.WrapAsScala._
@@ -17,6 +18,11 @@ object ModCoFHEnergy extends ModProxy {
 
   override def initialize() {
     FMLInterModComms.sendMessage(Mods.IDs.OpenComputers, "registerToolDurabilityProvider", "li.cil.oc.integration.cofh.energy.EventHandlerRedstoneFlux.getDurability")
+    val chargerNbt = new NBTTagCompound()
+    chargerNbt.setString("name", "RedstoneFlux")
+    chargerNbt.setString("canCharge", "li.cil.oc.integration.cofh.energy.EventHandlerRedstoneFlux.canCharge")
+    chargerNbt.setString("charge", "li.cil.oc.integration.cofh.energy.EventHandlerRedstoneFlux.charge")
+    FMLInterModComms.sendMessage(Mods.IDs.OpenComputers, "registerItemCharge", chargerNbt)
 
     MinecraftForge.EVENT_BUS.register(EventHandlerRedstoneFlux)
 
diff --git a/src/main/scala/li/cil/oc/integration/ic2/EventHandlerIndustrialCraft2.scala b/src/main/scala/li/cil/oc/integration/ic2/EventHandlerIndustrialCraft2.scala
index 3fbbc3e1e..52f345cbd 100644
--- a/src/main/scala/li/cil/oc/integration/ic2/EventHandlerIndustrialCraft2.scala
+++ b/src/main/scala/li/cil/oc/integration/ic2/EventHandlerIndustrialCraft2.scala
@@ -1,5 +1,6 @@
 package li.cil.oc.integration.ic2
 
+import li.cil.oc.Settings
 import li.cil.oc.api.event.RobotUsedToolEvent
 import net.minecraft.entity.player.EntityPlayer
 import net.minecraft.item.ItemStack
@@ -52,4 +53,20 @@ object EventHandlerIndustrialCraft2 {
       case _ => false
     }
   }
+
+  def canCharge(stack: ItemStack): Boolean = stack.getItem match {
+    case chargeable: IElectricItem => chargeable.getMaxCharge(stack) > 0
+    case _ => false
+  }
+
+  def charge(stack: ItemStack, amount: Double, simulate: Boolean): Double = {
+    (stack.getItem match {
+      case item: ISpecialElectricItem => Option(item.getManager(stack))
+      case item: IElectricItem => Option(ElectricItem.manager)
+      case _ => None
+    }) match {
+      case Some(manager) => amount - manager.charge(stack, amount * Settings.get.ratioIndustrialCraft2, Int.MaxValue, true, false) / Settings.get.ratioIndustrialCraft2
+      case _ => amount
+    }
+  }
 }
diff --git a/src/main/scala/li/cil/oc/integration/ic2/ModIndustrialCraft2.scala b/src/main/scala/li/cil/oc/integration/ic2/ModIndustrialCraft2.scala
index 00026997e..45d7add71 100644
--- a/src/main/scala/li/cil/oc/integration/ic2/ModIndustrialCraft2.scala
+++ b/src/main/scala/li/cil/oc/integration/ic2/ModIndustrialCraft2.scala
@@ -4,6 +4,7 @@ import cpw.mods.fml.common.event.FMLInterModComms
 import li.cil.oc.api.Driver
 import li.cil.oc.integration.ModProxy
 import li.cil.oc.integration.Mods
+import net.minecraft.nbt.NBTTagCompound
 import net.minecraftforge.common.MinecraftForge
 
 object ModIndustrialCraft2 extends ModProxy {
@@ -12,6 +13,11 @@ object ModIndustrialCraft2 extends ModProxy {
   override def initialize() {
     FMLInterModComms.sendMessage(Mods.IDs.OpenComputers, "registerToolDurabilityProvider", "li.cil.oc.integration.ic2.EventHandlerIndustrialCraft2.getDurability")
     FMLInterModComms.sendMessage(Mods.IDs.OpenComputers, "registerWrenchTool", "li.cil.oc.integration.ic2.EventHandlerIndustrialCraft2.useWrench")
+    val chargerNbt = new NBTTagCompound()
+    chargerNbt.setString("name", "IndustrialCraft2")
+    chargerNbt.setString("canCharge", "li.cil.oc.integration.ic2.EventHandlerIndustrialCraft2.canCharge")
+    chargerNbt.setString("charge", "li.cil.oc.integration.ic2.EventHandlerIndustrialCraft2.charge")
+    FMLInterModComms.sendMessage(Mods.IDs.OpenComputers, "registerItemCharge", chargerNbt)
 
     MinecraftForge.EVENT_BUS.register(EventHandlerIndustrialCraft2)
 
diff --git a/src/main/scala/li/cil/oc/integration/opencomputers/DriverTablet.scala b/src/main/scala/li/cil/oc/integration/opencomputers/DriverTablet.scala
index 4a1689d16..2a66f61c1 100644
--- a/src/main/scala/li/cil/oc/integration/opencomputers/DriverTablet.scala
+++ b/src/main/scala/li/cil/oc/integration/opencomputers/DriverTablet.scala
@@ -4,7 +4,10 @@ import li.cil.oc.Constants
 import li.cil.oc.Settings
 import li.cil.oc.api
 import li.cil.oc.api.driver.EnvironmentHost
+import li.cil.oc.api.network.Component
+import li.cil.oc.api.network.Visibility
 import li.cil.oc.common.Slot
+import li.cil.oc.common.item.Tablet
 import li.cil.oc.common.item.data.TabletData
 import net.minecraft.item.ItemStack
 import net.minecraft.nbt.NBTTagCompound
@@ -15,10 +18,20 @@ object DriverTablet extends Item {
     api.Items.get(Constants.ItemName.Tablet))
 
   override def createEnvironment(stack: ItemStack, host: EnvironmentHost) = {
+    Tablet.Server.cache.invalidate(Tablet.getId(stack))
     val data = new TabletData(stack)
     data.items.collect {
       case Some(fs) if DriverFileSystem.worksWith(fs) => fs
-    }.headOption.map(DriverFileSystem.createEnvironment(_, host)).orNull
+    }.headOption.map(DriverFileSystem.createEnvironment(_, host)) match {
+      case Some(environment) => environment.node match {
+        case component: Component =>
+          component.setVisibility(Visibility.Network)
+          environment.save(dataTag(stack))
+          environment
+        case _ => null
+      }
+      case _ => null
+    }
   }
 
   override def slot(stack: ItemStack) = Slot.Tablet
diff --git a/src/main/scala/li/cil/oc/integration/opencomputers/ModOpenComputers.scala b/src/main/scala/li/cil/oc/integration/opencomputers/ModOpenComputers.scala
index c5ed0c1ab..45b96b960 100644
--- a/src/main/scala/li/cil/oc/integration/opencomputers/ModOpenComputers.scala
+++ b/src/main/scala/li/cil/oc/integration/opencomputers/ModOpenComputers.scala
@@ -5,6 +5,7 @@ import li.cil.oc.OpenComputers
 import li.cil.oc.Settings
 import li.cil.oc.api
 import li.cil.oc.api.detail.ItemInfo
+import li.cil.oc.api.driver.item.Chargeable
 import li.cil.oc.api.internal
 import li.cil.oc.api.internal.Wrench
 import li.cil.oc.api.manual.PathProvider
@@ -56,6 +57,11 @@ object ModOpenComputers extends ModProxy {
     TemplateBlacklist.register()
 
     FMLInterModComms.sendMessage(Mods.IDs.OpenComputers, "registerWrenchTool", "li.cil.oc.integration.opencomputers.ModOpenComputers.useWrench")
+    val chargerNbt = new NBTTagCompound()
+    chargerNbt.setString("name", "OpenComputers")
+    chargerNbt.setString("canCharge", "li.cil.oc.integration.opencomputers.ModOpenComputers.canCharge")
+    chargerNbt.setString("charge", "li.cil.oc.integration.opencomputers.ModOpenComputers.charge")
+    FMLInterModComms.sendMessage(Mods.IDs.OpenComputers, "registerItemCharge", chargerNbt)
 
     ForgeChunkManager.setForcedChunkLoadingCallback(OpenComputers, ChunkloaderUpgradeHandler)
 
@@ -227,6 +233,18 @@ object ModOpenComputers extends ModProxy {
     }
   }
 
+  def canCharge(stack: ItemStack): Boolean = stack.getItem match {
+    case chargeable: Chargeable => chargeable.canCharge(stack)
+    case _ => false
+  }
+
+  def charge(stack: ItemStack, amount: Double, simulate: Boolean): Double = {
+    stack.getItem match {
+      case chargeable: Chargeable => chargeable.charge(stack, amount, simulate)
+      case _ => 0.0
+    }
+  }
+
   private def blacklistHost(host: Class[_], itemNames: String*) {
     for (itemName <- itemNames) {
       val nbt = new NBTTagCompound()
diff --git a/src/main/scala/li/cil/oc/integration/util/ItemCharge.scala b/src/main/scala/li/cil/oc/integration/util/ItemCharge.scala
new file mode 100644
index 000000000..22421d78b
--- /dev/null
+++ b/src/main/scala/li/cil/oc/integration/util/ItemCharge.scala
@@ -0,0 +1,24 @@
+package li.cil.oc.integration.util
+
+import java.lang.reflect.Method
+
+import li.cil.oc.common.IMC
+import net.minecraft.item.ItemStack
+
+import scala.collection.mutable
+
+object ItemCharge {
+  private val chargers = mutable.LinkedHashSet.empty[(Method, Method)]
+
+  def add(canCharge: Method, charge: Method): Unit = chargers += ((canCharge, charge))
+
+  def canCharge(stack: ItemStack): Boolean = stack != null && chargers.exists(charger => IMC.tryInvokeStatic(charger._1, stack)(false))
+
+  def charge(stack: ItemStack, amount: Double): Double = {
+    if (stack != null) chargers.find(charger => IMC.tryInvokeStatic(charger._1, stack)(false)) match {
+      case Some(charger) => IMC.tryInvokeStatic(charger._2, stack, double2Double(amount), java.lang.Boolean.FALSE)(0.0)
+      case _ => 0.0
+    }
+    else 0.0
+  }
+}
diff --git a/src/main/scala/li/cil/oc/server/component/Server.scala b/src/main/scala/li/cil/oc/server/component/Server.scala
index c7b792a2e..eb8faea29 100644
--- a/src/main/scala/li/cil/oc/server/component/Server.scala
+++ b/src/main/scala/li/cil/oc/server/component/Server.scala
@@ -39,7 +39,7 @@ class Server(val rack: tileentity.ServerRack, val slot: Int) extends Environment
   // ----------------------------------------------------------------------- //
 
   override def internalComponents(): Iterable[ItemStack] = (0 until inventory.getSizeInventory).collect {
-    case i if inventory.isComponentSlot(i) && inventory.getStackInSlot(i) != null => inventory.getStackInSlot(i)
+    case i if inventory.getStackInSlot(i) != null && inventory.isComponentSlot(i, inventory.getStackInSlot(i)) => inventory.getStackInSlot(i)
   }
 
   override def componentSlot(address: String) = inventory.components.indexWhere(_.exists(env => env.node != null && env.node.address == address))