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Nerd Ralph loves cheap and dirty hacks, and for that we applaud him. His latest endeavor is a LiFePO4 battery charger that he made out of parts he had on hand for under $0.50 US. (Although we ...

The device is a secondary (rechargeable) battery pack with an average voltage of 25.6V and a rated capacity of 20Ah. Up to two batteries can be connected in series to produce 48V, and up to ten units ...