@Override
 public void guiObjectEvent(IGuiObject object) {
   if (object == powerOn) {
     render.clientSend(BatteryChargerElement.toogleCharge);
   }
   super.guiObjectEvent(object);
 }
  @Override
  protected void preDraw(float f, int x, int y) {
    super.preDraw(f, x, y);

    if (render.powerOn) {
      powerOn.displayString = "Is ON";
    } else {
      powerOn.displayString = "Is OFF";
    }
  }
 @Override
 public void initGui() {
   super.initGui();
   powerOn = newGuiButton(97 + 10, 6 + 17 - 10, 40, "");
 }