Charge up anywhere.
Basically if you need to recharge your energy and you're nowhere near any free source of electricity (eg: in a black out area), you can simply fire a couple of normal blasts at something that conducts electricity (barrels, steel girders etc) you are then able to drain about 2 blast cores of energy from whatever it is that you have just shot. So you don't use any energy from firing the blasts but can pick up full enegy if you do it a few times in a row.
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