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The Energy Crystal is a storage unit capable of storing up to 100,000 EU. It can be recharged in an MFE unit, an MFSU unit, or a GregTech Charge-O-Mat. The Energy Crystal is also used in a variety of recipes, mainly that of Nano Armour and Lapotron Crystals.
Unlike RE Batteries, right-clicking an Energy Crystal does not recharge the electric tools in your inventory.