The Energy Loader and Energy Unloader are used to provide an interface between EU and Energy Carts, such as the BatBox Cart, MFE Cart, and MFSU Cart. They possess a number of advanced features unique to IC2 machines. By default they input and output at 512 EU/t. When one of the selected options triggers, it sends out a Redstone current allowing for launch from a Holding Rail or Boarding Rail. The front of the Loader/Unloader must be facing the cart to charge or discharge.