The mark I prototype is a successful failure.
Everything worked, for a while. The battery showed a nominal 12V and could power a salvaged e-bike tail light, and later a pair of 5V LED strips wired in series.
But then something went wrong - either the BMS shorted and took a cell with it, or vice versa. I have some (hopefully) better BMS boards on order and will build the mark II when they arrive.
I've also ordered a few options for the lights and will test them head to head.
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