Standard Energy Units (SEU) are a unit of measurement for power supplies. They measure the output of a generator, and the capacity of power packs and batteries.

SEUs are generally stored in multi-capacitor, single-use (i.e. non-rechargeable) devices such as Powerclips, mini-powerclips and power discs, or in rechargeable active-matrix devices such as Power Beltpacks, Power Backpacks and batteries.

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