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Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
@DrBard
Adding to what we know.
I have seen on my own bangle the % of battery go from 1-3 and then move around that level for the rest of the day. I think it is clear the battery % is not very accurate