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Emyr-
Heh, a tail light with one of those is going to need a solid alu body and heat dissipation fins.
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I'll see your puny cells and raise you the 18650 cell.
Hope District+ has two of those, I think. It lasts so long you forget the last time you charged it and goes from sensible to unsafely bright. Also has an interchangeable battery pack with some of their front lights (e.g. the now-discontinued Vision 2) which you can use with a splitter cable to power both from the same pack.
Velocio
rhowe
Most nights we have on USB charge some combination of:
It's already a mess of cables.
What I want are higher capacity batteries that last longer (get charged less frequently) and that I can swap out for spares. What I want are batteries that charge faster and can discharge faster (higher voltage) so that the lights are bright.
That exists today, they're called CR123 batteries. They charge fast, hold a ton of charge, and can power really bright lights (my torch uses one and goes to 500 lumens).
So yeah... USB charge can >>>>>>>>>>>>>>
I liked the Moon for brightness and cheapness, but when I can afford to I'll go back to Exposure for battery support + brightness.