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    48v charging

    I have a 48V mid drive bike, any way to charge the battery with a 12 automotive battery? (panasonic 48v)

    #2
    No elegant way.

    You can use some automotive AC inverters from the 12VDC battery powering the AC wall charger.

    There's also DC-DC "buck converters" but they're awfully inefficient and easy to screw-up adjusting for that amount of DC voltage conversion.

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