diff --git a/Plugin Cubot/src/net/simon987/cubotplugin/Cubot.java b/Plugin Cubot/src/net/simon987/cubotplugin/Cubot.java
index 116f6fa..bc75d55 100644
--- a/Plugin Cubot/src/net/simon987/cubotplugin/Cubot.java	
+++ b/Plugin Cubot/src/net/simon987/cubotplugin/Cubot.java	
@@ -1,5 +1,6 @@
 package net.simon987.cubotplugin;
 
+import net.simon987.server.GameServer;
 import net.simon987.server.game.ControllableUnit;
 import net.simon987.server.game.Direction;
 import net.simon987.server.game.GameObject;
@@ -30,6 +31,9 @@ public class Cubot extends GameObject implements Updatable, ControllableUnit {
 
     private User parent;
 
+    private int energy;
+    private int maxEnergy;
+
     public Cubot() {
 
     }
@@ -43,8 +47,12 @@ public class Cubot extends GameObject implements Updatable, ControllableUnit {
     public void update() {
 
         if (currentAction == CubotAction.WALKING) {
-            if (!incrementLocation()) {
-                //Couldn't walk
+            if (spendEnergy(100)) {
+                if (!incrementLocation()) {
+                    //Couldn't walk
+                    currentAction = CubotAction.IDLE;
+                }
+            } else {
                 currentAction = CubotAction.IDLE;
             }
         }
@@ -74,6 +82,7 @@ public class Cubot extends GameObject implements Updatable, ControllableUnit {
         json.put("hp", hp);
         json.put("action", lastAction.ordinal());
         json.put("holo", (int) lastHologram);
+        json.put("energy", (int) lastHologram);
 
         if (parent != null) {
             json.put("parent", parent.getUsername()); //Only used client-side for now
@@ -91,6 +100,8 @@ public class Cubot extends GameObject implements Updatable, ControllableUnit {
         cubot.hp = (int)(long)json.get("hp");
         cubot.setDirection(Direction.getDirection((int)(long)json.get("direction")));
         cubot.heldItem = (int)(long)json.get("heldItem");
+        cubot.energy = (int) (long) json.get("energy");
+        cubot.maxEnergy = GameServer.INSTANCE.getConfig().getInt("battery_max_energy");
 
         return cubot;
 
@@ -141,4 +152,33 @@ public class Cubot extends GameObject implements Updatable, ControllableUnit {
     public char getHologram() {
         return lastHologram;
     }
+
+
+    public int getEnergy() {
+        return energy;
+    }
+
+    public void setEnergy(int energy) {
+        this.energy = energy;
+    }
+
+    public boolean spendEnergy(int spent) {
+
+        if (energy - spent < 0) {
+            return false;
+        } else {
+            energy -= spent;
+            return true;
+        }
+
+
+    }
+
+    public void setMaxEnergy(int maxEnergy) {
+        this.maxEnergy = maxEnergy;
+    }
+
+    public int getMaxEnergy() {
+        return maxEnergy;
+    }
 }
diff --git a/Plugin Cubot/src/net/simon987/cubotplugin/CubotBattery.java b/Plugin Cubot/src/net/simon987/cubotplugin/CubotBattery.java
new file mode 100644
index 0000000..93f57d2
--- /dev/null
+++ b/Plugin Cubot/src/net/simon987/cubotplugin/CubotBattery.java	
@@ -0,0 +1,59 @@
+package net.simon987.cubotplugin;
+
+import net.simon987.server.GameServer;
+import net.simon987.server.assembly.CpuHardware;
+import net.simon987.server.assembly.Status;
+import org.json.simple.JSONObject;
+
+public class CubotBattery extends CpuHardware {
+
+    public static final int DEFAULT_ADDRESS = 0x000A;
+
+    /**
+     * Hardware ID (Should be unique)
+     */
+    public static final char HWID = 0x000A;
+
+    private Cubot cubot;
+    private static final int POLL = 1;
+    private static final int GET_MAX_CAPACITY = 2;
+
+    public CubotBattery(Cubot cubot) {
+        this.cubot = cubot;
+    }
+
+    @Override
+    public void handleInterrupt(Status status) {
+
+        int a = getCpu().getRegisterSet().getRegister("A").getValue();
+
+        if (a == POLL) {
+            getCpu().getRegisterSet().getRegister("B").setValue(cubot.getEnergy());
+
+        } else if (a == GET_MAX_CAPACITY) {
+            getCpu().getRegisterSet().getRegister("B").setValue(cubot.getMaxEnergy());
+        } else if (a == 0xFFFF) {
+            cubot.setEnergy(cubot.getMaxEnergy());
+        }
+
+    }
+
+    @Override
+    public char getId() {
+        return HWID;
+    }
+
+    @Override
+    public JSONObject serialise() {
+        JSONObject json = new JSONObject();
+        json.put("hwid", (int) HWID);
+        json.put("cubot", cubot.getObjectId());
+
+        return json;
+    }
+
+    public static CubotBattery deserialize(JSONObject hwJSON) {
+        return new CubotBattery((Cubot) GameServer.INSTANCE.getGameUniverse().getObject((int) (long) hwJSON.get("cubot")));
+    }
+
+}
diff --git a/Plugin Cubot/src/net/simon987/cubotplugin/CubotDrill.java b/Plugin Cubot/src/net/simon987/cubotplugin/CubotDrill.java
index beaa338..9f8060e 100644
--- a/Plugin Cubot/src/net/simon987/cubotplugin/CubotDrill.java	
+++ b/Plugin Cubot/src/net/simon987/cubotplugin/CubotDrill.java	
@@ -40,19 +40,19 @@ public class CubotDrill extends CpuHardware {
 
         } else if (a == GATHER_SLOW || a == GATHER_FAST) {
 
-            if (cubot.getAction() == CubotAction.IDLE) {
-                int tile = cubot.getWorld().getTileMap().getTileAt(cubot.getX(), cubot.getY());
+            if (cubot.spendEnergy(1400)) {
+                if (cubot.getAction() == CubotAction.IDLE) {
+                    int tile = cubot.getWorld().getTileMap().getTileAt(cubot.getX(), cubot.getY());
 
-                if (tile == TileMap.IRON_TILE) {
-                    cubot.setHeldItem(TileMap.ITEM_IRON);
-                    cubot.setCurrentAction(CubotAction.DIGGING);
+                    if (tile == TileMap.IRON_TILE) {
+                        cubot.setHeldItem(TileMap.ITEM_IRON);
+                        cubot.setCurrentAction(CubotAction.DIGGING);
 
-                } else if (tile == TileMap.COPPER_TILE) {
-                    cubot.setHeldItem(TileMap.ITEM_COPPER);
-                    cubot.setCurrentAction(CubotAction.DIGGING);
+                    } else if (tile == TileMap.COPPER_TILE) {
+                        cubot.setHeldItem(TileMap.ITEM_COPPER);
+                        cubot.setCurrentAction(CubotAction.DIGGING);
 
-                } else {
-                    //System.out.println("FAILED: dig");
+                    }
                 }
             }
 
diff --git a/Plugin Cubot/src/net/simon987/cubotplugin/CubotInventory.java b/Plugin Cubot/src/net/simon987/cubotplugin/CubotInventory.java
index 7557366..3b3cc98 100644
--- a/Plugin Cubot/src/net/simon987/cubotplugin/CubotInventory.java	
+++ b/Plugin Cubot/src/net/simon987/cubotplugin/CubotInventory.java	
@@ -38,7 +38,9 @@ public class CubotInventory extends CpuHardware {
             getCpu().getRegisterSet().getRegister("B").setValue(cubot.getHeldItem());
 
         } else if (a == CLEAR) {
-            cubot.setHeldItem(0);
+            if (cubot.spendEnergy(100)) {
+                cubot.setHeldItem(0);
+            }
         }
 
     }
diff --git a/Plugin Cubot/src/net/simon987/cubotplugin/CubotLaser.java b/Plugin Cubot/src/net/simon987/cubotplugin/CubotLaser.java
index af33087..2a36834 100644
--- a/Plugin Cubot/src/net/simon987/cubotplugin/CubotLaser.java	
+++ b/Plugin Cubot/src/net/simon987/cubotplugin/CubotLaser.java	
@@ -22,6 +22,7 @@ public class CubotLaser extends CpuHardware {
     private Cubot cubot;
 
     private static final int WITHDRAW = 1;
+    private static final int DEPOSIT = 2;
 
 
     public CubotLaser(Cubot cubot) {
@@ -42,33 +43,29 @@ public class CubotLaser extends CpuHardware {
 
         if(a == WITHDRAW) {
 
-            //System.out.println("withdraw");
 
             Point frontTile = cubot.getFrontTile();
             ArrayList<GameObject> objects = cubot.getWorld().getGameObjectsAt(frontTile.x, frontTile.y);
 
 
             if (cubot.getAction() != CubotAction.IDLE && objects.size() > 0) {
-
+                //FIXME: Problem here if more than 1 object
                 if (objects.get(0) instanceof InventoryHolder) {
-                    //Take the item
-                    if (((InventoryHolder) objects.get(0)).takeItem(b)) {
+                    if (((InventoryHolder) objects.get(0)).canTakeItem(b)) {
+                        if (cubot.spendEnergy(30)) {
+                            //Take the item
+                            ((InventoryHolder) objects.get(0)).takeItem(b);
 
-                        cubot.setHeldItem(b);
-                        //System.out.println("took " + b);
-                        cubot.setCurrentAction(CubotAction.WITHDRAWING);
-
-                    } else {
-                        //The inventory holder can't provide this item
-                        //todo Add emote here
-                        //  System.out.println("DEBUG: FAILED: take (The inventory holder can't provide this item)");
+                            cubot.setHeldItem(b);
+                            cubot.setCurrentAction(CubotAction.WITHDRAWING);
+                        }
                     }
-
                 }
-            } else {
-                //Nothing in front
-                //    System.out.println("DEBUG: FAILED: take (Nothing in front or Cubot is busy)");
             }
+
+
+        } else if (a == DEPOSIT) {
+
         }
 
     }
diff --git a/Plugin Cubot/src/net/simon987/cubotplugin/CubotLeg.java b/Plugin Cubot/src/net/simon987/cubotplugin/CubotLeg.java
index 2fb905b..17dff77 100644
--- a/Plugin Cubot/src/net/simon987/cubotplugin/CubotLeg.java	
+++ b/Plugin Cubot/src/net/simon987/cubotplugin/CubotLeg.java	
@@ -39,11 +39,14 @@ public class CubotLeg extends CpuHardware implements JSONSerialisable {
 
         if(a == SET_DIR){
 
+
             Direction dir = Direction.getDirection(b);
 
             if(dir != null){
-                cubot.setDirection(Direction.getDirection(b));
-                status.setErrorFlag(false);
+                if (cubot.spendEnergy(20)) {
+                    cubot.setDirection(Direction.getDirection(b));
+                    status.setErrorFlag(false);
+                }
             } else {
                 status.setErrorFlag(true);
             }
diff --git a/Plugin Cubot/src/net/simon987/cubotplugin/CubotLidar.java b/Plugin Cubot/src/net/simon987/cubotplugin/CubotLidar.java
index c9512b5..e3b5f06 100644
--- a/Plugin Cubot/src/net/simon987/cubotplugin/CubotLidar.java	
+++ b/Plugin Cubot/src/net/simon987/cubotplugin/CubotLidar.java	
@@ -52,75 +52,79 @@ public class CubotLidar extends CpuHardware implements JSONSerialisable {
                 getCpu().getRegisterSet().getRegister("Y").setValue(cubot.getY());
                 break;
             case GET_PATH:
-                int b = getCpu().getRegisterSet().getRegister("B").getValue();
-                int destX = getCpu().getRegisterSet().getRegister("X").getValue();
-                int destY = getCpu().getRegisterSet().getRegister("Y").getValue();
+                if (cubot.spendEnergy(50)) {
+                    int b = getCpu().getRegisterSet().getRegister("B").getValue();
+                    int destX = getCpu().getRegisterSet().getRegister("X").getValue();
+                    int destY = getCpu().getRegisterSet().getRegister("Y").getValue();
 
-                //Get path
-                ArrayList<Node> nodes = Pathfinder.findPath(cubot.getWorld(), cubot.getX(), cubot.getY(),
-                        destX, destY, b);
+                    //Get path
+                    ArrayList<Node> nodes = Pathfinder.findPath(cubot.getWorld(), cubot.getX(), cubot.getY(),
+                            destX, destY, b);
 
-//                System.out.println(nodes.size() + " nodes");
+                    //Write to memory
+                    byte[] mem = getCpu().getMemory().getBytes();
 
-                //Write to memory
-                byte[] mem = getCpu().getMemory().getBytes();
+                    int counter = MEMORY_PATH_START;
 
-                int counter = MEMORY_PATH_START;
+                    if (nodes != null) {
 
-                if (nodes != null) {
+                        Node lastNode = null;
 
-                    Node lastNode = null;
+                        for (Node n : nodes) {
+                            //Store the path as a sequence of directions
 
-                    for (Node n : nodes) {
-                        //Store the path as a sequence of directions
+                            if (lastNode == null) {
+                                lastNode = n;
+                                continue;
+                            }
+
+                            if (n.x < lastNode.x) {
+                                //West
+                                mem[counter++] = 0;
+                                mem[counter++] = 3;
+                            } else if (n.x > lastNode.x) {
+                                //East
+                                mem[counter++] = 0;
+                                mem[counter++] = 1;
+                            } else if (n.y < lastNode.y) {
+                                //North
+                                mem[counter++] = 0;
+                                mem[counter++] = 0;
+                            } else if (n.y > lastNode.y) {
+                                //South
+                                mem[counter++] = 0;
+                                mem[counter++] = 2;
+                            }
 
-                        if (lastNode == null) {
                             lastNode = n;
-                            continue;
                         }
 
-                        if (n.x < lastNode.x) {
-                            //West
-                            mem[counter++] = 0;
-                            mem[counter++] = 3;
-                        } else if (n.x > lastNode.x) {
-                            //East
-                            mem[counter++] = 0;
-                            mem[counter++] = 1;
-                        } else if (n.y < lastNode.y) {
-                            //North
-                            mem[counter++] = 0;
-                            mem[counter++] = 0;
-                        } else if (n.y > lastNode.y) {
-                            //South
-                            mem[counter++] = 0;
-                            mem[counter++] = 2;
-                        }
-
-                        lastNode = n;
+                        //Indicate end of path with 0xAAAA
+                        mem[counter++] = -86;
+                        mem[counter] = -86;
+                    } else {
+                        //Indicate invalid path 0xFFFF
+                        mem[counter++] = -1;
+                        mem[counter] = -1;
                     }
 
-                    //Indicate end of path with 0xAAAA
-                    mem[counter++] = -86;
-                    mem[counter] = -86;
-                } else {
-                    //Indicate invalid path 0xFFFF
-                    mem[counter++] = -1;
-                    mem[counter] = -1;
+                    LogManager.LOGGER.fine("DEBUG: path to" + destX + "," + destY);
                 }
 
-                LogManager.LOGGER.fine("DEBUG: path to" + destX + "," + destY);
                 break;
 
             case GET_MAP:
-                char[][] mapInfo = cubot.getWorld().getMapInfo();
+                if (cubot.spendEnergy(10)) {
+                    char[][] mapInfo = cubot.getWorld().getMapInfo();
 
-                int i = MEMORY_MAP_START;
-                for (int y = 0; y < World.WORLD_SIZE; y++) {
-                    for (int x = 0; x < World.WORLD_SIZE; x++) {
-                        getCpu().getMemory().set(i++, mapInfo[x][y]);
+                    int i = MEMORY_MAP_START;
+                    for (int y = 0; y < World.WORLD_SIZE; y++) {
+                        for (int x = 0; x < World.WORLD_SIZE; x++) {
+                            getCpu().getMemory().set(i++, mapInfo[x][y]);
+                        }
                     }
                 }
+
                 break;
             case GET_WORLD_POS:
                 getCpu().getRegisterSet().getRegister("X").setValue(cubot.getWorld().getX());
diff --git a/Plugin Cubot/src/net/simon987/cubotplugin/CubotPlugin.java b/Plugin Cubot/src/net/simon987/cubotplugin/CubotPlugin.java
index 31cc603..b96ad16 100644
--- a/Plugin Cubot/src/net/simon987/cubotplugin/CubotPlugin.java	
+++ b/Plugin Cubot/src/net/simon987/cubotplugin/CubotPlugin.java	
@@ -53,6 +53,8 @@ public class CubotPlugin extends ServerPlugin implements GameObjectDeserializer,
                 return Keyboard.deserialize(hwJson);
             case CubotHologram.HWID:
                 return CubotHologram.deserialize(hwJson);
+            case CubotBattery.HWID:
+                return CubotBattery.deserialize(hwJson);
         }
 
         return null;
diff --git a/Plugin Cubot/src/net/simon987/cubotplugin/Keyboard.java b/Plugin Cubot/src/net/simon987/cubotplugin/Keyboard.java
index 46830d4..e3bab5e 100644
--- a/Plugin Cubot/src/net/simon987/cubotplugin/Keyboard.java	
+++ b/Plugin Cubot/src/net/simon987/cubotplugin/Keyboard.java	
@@ -9,9 +9,6 @@ public class Keyboard extends CpuHardware {
 
     public static final int DEFAULT_ADDRESS = 4;
 
-    public static final String NAME = "Wireless Keyboard";
-
-
     private static final int CLEAR_BUFFER = 0;
     private static final int FETCH_KEY = 1;
     
diff --git a/Plugin Cubot/src/net/simon987/cubotplugin/event/CpuInitialisationListener.java b/Plugin Cubot/src/net/simon987/cubotplugin/event/CpuInitialisationListener.java
index 7c962f8..00df370 100644
--- a/Plugin Cubot/src/net/simon987/cubotplugin/event/CpuInitialisationListener.java	
+++ b/Plugin Cubot/src/net/simon987/cubotplugin/event/CpuInitialisationListener.java	
@@ -35,6 +35,8 @@ public class CpuInitialisationListener implements GameEventListener {
         invHw.setCpu(cpu);
         CubotHologram emoteHw = new CubotHologram((Cubot) user.getControlledUnit());
         emoteHw.setCpu(cpu);
+        CubotBattery batteryHw = new CubotBattery((Cubot) user.getControlledUnit());
+        batteryHw.setCpu(cpu);
 
         cpu.attachHardware(legHw, CubotLeg.DEFAULT_ADDRESS);
         cpu.attachHardware(laserHw, CubotLaser.DEFAULT_ADDRESS);
@@ -44,5 +46,6 @@ public class CpuInitialisationListener implements GameEventListener {
         cpu.attachHardware(invHw, CubotInventory.DEFAULT_ADDRESS);
         cpu.attachHardware(invHw, CubotInventory.DEFAULT_ADDRESS);
         cpu.attachHardware(emoteHw, CubotHologram.DEFAULT_ADDRESS);
+        cpu.attachHardware(batteryHw, CubotBattery.DEFAULT_ADDRESS);
     }
 }
diff --git a/Plugin Cubot/src/net/simon987/cubotplugin/event/UserCreationListener.java b/Plugin Cubot/src/net/simon987/cubotplugin/event/UserCreationListener.java
index 72ed7cd..918d7a5 100644
--- a/Plugin Cubot/src/net/simon987/cubotplugin/event/UserCreationListener.java	
+++ b/Plugin Cubot/src/net/simon987/cubotplugin/event/UserCreationListener.java	
@@ -34,6 +34,9 @@ public class UserCreationListener implements GameEventListener {
 
         cubot.setHeldItem(GameServer.INSTANCE.getConfig().getInt("new_user_item"));
 
+        cubot.setEnergy(GameServer.INSTANCE.getConfig().getInt("battery_max_energy"));
+        cubot.setMaxEnergy(GameServer.INSTANCE.getConfig().getInt("battery_max_energy"));
+
         cubot.setParent(user);
 
         Point point = cubot.getWorld().getRandomPassableTile();
diff --git a/Plugin Misc HW/src/net/simon987/mischwplugin/event/CpuInitialisationListener.java b/Plugin Misc HW/src/net/simon987/mischwplugin/event/CpuInitialisationListener.java
index 8d6973c..2587d49 100644
--- a/Plugin Misc HW/src/net/simon987/mischwplugin/event/CpuInitialisationListener.java	
+++ b/Plugin Misc HW/src/net/simon987/mischwplugin/event/CpuInitialisationListener.java	
@@ -19,7 +19,12 @@ public class CpuInitialisationListener implements GameEventListener {
 
         CPU cpu = (CPU) event.getSource();
 
-        cpu.attachHardware(new RandomNumberGenerator(), RandomNumberGenerator.DEFAULT_ADDRESS);
-        cpu.attachHardware(new Clock(), Clock.DEFAULT_ADDRESS);
+        RandomNumberGenerator rngHW = new RandomNumberGenerator();
+        rngHW.setCpu(cpu);
+        Clock clock = new Clock();
+        clock.setCpu(cpu);
+
+        cpu.attachHardware(rngHW, RandomNumberGenerator.DEFAULT_ADDRESS);
+        cpu.attachHardware(clock, Clock.DEFAULT_ADDRESS);
     }
 }
\ No newline at end of file
diff --git a/Plugin Plant/src/net/simon987/plantplugin/Plant.java b/Plugin Plant/src/net/simon987/plantplugin/Plant.java
index 0a9275f..b1729f7 100644
--- a/Plugin Plant/src/net/simon987/plantplugin/Plant.java	
+++ b/Plugin Plant/src/net/simon987/plantplugin/Plant.java	
@@ -132,30 +132,28 @@ public class Plant extends GameObject implements Updatable, InventoryHolder{
         return false;
     }
 
+    @Override
+    public boolean canTakeItem(int item) {
+        return item == ITM_BIOMASS && grown && biomassCount >= 1;
+    }
+
     /**
      * Called when an object attempts to take an item from this Plant.
      * If the object requests biomass, it will be subtracted from biomassCount, and
      * if it reaches 0, the plant is deleted
      *
      * @param item item id (see MarConstants.ITEM_*)
-     * @return true if the requested item is ITEM_BIOMASS and if the plant is grown
      */
     @Override
-    public boolean takeItem(int item) {
+    public void takeItem(int item) {
 
         if (item == ITM_BIOMASS) {
             if (grown && biomassCount > 1) {
                 biomassCount--;
-                return true;
             } else if (grown) {
                 //Delete plant
                 setDead(true);
-                return true;
-            } else {
-                return false;
             }
-        } else {
-            return false;
         }
 
     }
diff --git a/Server/src/net/simon987/server/GameServer.java b/Server/src/net/simon987/server/GameServer.java
index 385eae7..1f26406 100644
--- a/Server/src/net/simon987/server/GameServer.java
+++ b/Server/src/net/simon987/server/GameServer.java
@@ -15,6 +15,7 @@ import org.json.simple.JSONObject;
 import java.io.File;
 import java.io.FileWriter;
 import java.io.IOException;
+import java.util.ArrayList;
 
 public class GameServer implements Runnable {
 
@@ -112,7 +113,9 @@ public class GameServer implements Runnable {
         }
 
         //Process each worlds
-        for (World world : gameUniverse.getWorlds()) {
+        //Avoid concurrent modification
+        ArrayList<World> worlds = new ArrayList<>(gameUniverse.getWorlds());
+        for (World world : worlds) {
            world.update();
         }
 
diff --git a/Server/src/net/simon987/server/assembly/CPU.java b/Server/src/net/simon987/server/assembly/CPU.java
index da5778a..d9d7543 100755
--- a/Server/src/net/simon987/server/assembly/CPU.java
+++ b/Server/src/net/simon987/server/assembly/CPU.java
@@ -444,5 +444,11 @@ public class CPU implements JSONSerialisable{
         return str;
     }
 
+    public CpuHardware getHardware(int address) {
+
+        return attachedHardware.get(address);
+
+    }
+
 
 }
diff --git a/Server/src/net/simon987/server/game/GameObject.java b/Server/src/net/simon987/server/game/GameObject.java
index 3ac815a..a5e45ca 100755
--- a/Server/src/net/simon987/server/game/GameObject.java
+++ b/Server/src/net/simon987/server/game/GameObject.java
@@ -120,9 +120,6 @@ public abstract class GameObject implements JSONSerialisable {
             x = newX;
             y = newY;
         } else {
-            //Display error when object is trying to walk in a wall
-            //TODO Add emote here
-            //System.out.println("DEBUG: FAILED walk");
             return false;
         }
 
diff --git a/Server/src/net/simon987/server/game/InventoryHolder.java b/Server/src/net/simon987/server/game/InventoryHolder.java
index 7df1111..f60b2cd 100644
--- a/Server/src/net/simon987/server/game/InventoryHolder.java
+++ b/Server/src/net/simon987/server/game/InventoryHolder.java
@@ -13,8 +13,12 @@ public interface InventoryHolder {
     /**
      * Take an item from the inventory
      * @param item Desired item id (see MarConstants.ITEM_*)
-     * @return true is the take item action executed properly, true also means that the desired item
-     * was removed from the inventory
      */
-    boolean takeItem(int item);
+    void takeItem(int item);
+
+    /**
+     * @param item item to take
+     * @return true if the InventoryHolder can provide this item
+     */
+    boolean canTakeItem(int item);
 }
diff --git a/config.properties b/config.properties
index fe03606..a1eac5a 100644
--- a/config.properties
+++ b/config.properties
@@ -41,6 +41,8 @@ plant_grow_time=32
 minTreeCount=3
 # Maximum tree count for the WorldGenerator
 maxTreeCount=10
+# Maximum energy of the battery hardware in kJ
+battery_max_energy=60000
 # ----------------------------------------------
 # Minimum center point count for the WorldGenerator
 wg_centerPointCountMin=5
diff --git a/plugins/Cubot.jar b/plugins/Cubot.jar
index 2810bdf..fb49b22 100644
Binary files a/plugins/Cubot.jar and b/plugins/Cubot.jar differ
diff --git a/plugins/Plant.jar b/plugins/Plant.jar
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diff --git a/plugins/Plugin Misc HW.jar b/plugins/Plugin Misc HW.jar
index 33c3207..689cf46 100644
Binary files a/plugins/Plugin Misc HW.jar and b/plugins/Plugin Misc HW.jar differ