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  1. Simple cheap ($5) battery charger module (CV/CC buck reg)

    Batteries and Charging
    I just found this constant current / constant voltage step down (buck) charger module that can supply up to 3 amps and 30 VDC from a DC source, and it has an LED indicating charging and full charge (OK). This should work for small lithium battery packs or single cells, or even one or two 12V...