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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.
@Gordon
That's great! Thanks for those graphs!
And yes, it'll be exactly as @AkosLukacs says - battery percentage is currently linear: https://github.com/espruino/Espruino/blob/master/libs/banglejs/jswrap_bangle.c#L1114
It'd be interesting to see if it could be tweaked slightly to provide a more linear reading.