Quote:
Originally Posted by Carbonita
Update 16mar2024: tested with benchtop power supply at 3.7V resulting in green button light on, and out-front LED working as well. Then used the 21700 cell (at 4.1V charge) which now also works. Will update if future unexplained failures occur.
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I bought a couple extra 21700 and a charger, perhaps a new cell would solve this problem for you.