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    Big spark from the charge port

    I decided to pull my battery off my bike last night because it was going to be getting cold and my bike lives in an unheated garage. It is also a fairly dimly lit garage. I couldn't really see what I was doing and I stuck the key in the charge port resulting in a large spark. I burned the -...
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    It's dead Jim. Dead battery pack

    Magnum bike with a 48V, 13AH battery. Woman left her house with a full charge, rode 3km, had coffee, hopped on her bike and it was dead. I put a meter on it and it shows 0.6V. I now sits on my bench. I checked fuses on both ends both good. Dead cell or BMS?
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    I have a battery pack from a BH Atom X.

    I have a battery pack from a BH Atom X. The electronics failed so I ripped into it. It's a 55 x 16500-35E cell pack with a charge of 44.5V (39.6V, 700WAh) 11x5. Kinda like 36V pack that goes to 11. The pack, if I decide not to rip it apart and make a 48V pack, will drive a 36V Bafang hub...
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    Using a hub motor as a mid drive?

    I'm in the conceptual design phase of building a recumbent bike. Typically these thing have chain lines that are 5-6' long so usually need an idler pulley. So I got thinking, why not 2 chains? Why not make the idler a hub motor? Why not make it a 2 speed hub motor? Why not put a mid derailleur...
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