For the price of a mid-range Android phone, [Kenneth Finnegan] turned a 50 caliber ammo can into a 50 amp-hour portable power supply. The battery pack uses four 3.5 V LiFePO 4 cells wired in ...
with an overall goal of shaving roughly 20 pounds off of the current weight of a can of .50 cal ammo, as Task & Purpose previously reported. Because polymer ammo is highly heat-absorbent ...
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