Join Date: Sep 2005
Bikes: Windsor Fens, Giant Seek 0 (2014, Alfine 8 + discs)
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I imagine the indicator just goes by voltage. It'd go off at a different time.
Sure, as long as the voltage is in range, I'm sure it'd work fine. I have a friend who is using two MagicShine lightheads running off his 48 volt eBike pack using a couple of buck voltage converters.
The protection circuit on the LiIon is simply in case the wires fray and short out - if you have never seen what a LiIon does when shorted without protection circuits, check YouTube. It would be "exciting" to have that happen on your bike while riding.
NiMH doesn't like getting shorted either, but the effects would generally be limited to getting really damn hot and probably melting the plastic it's in, not exploding, catching fire or jetting around on a rocket of steam.
Work: the 8 hours that separates bike rides.