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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
Yes, just to add that the battery voltage is used to work out the charge level. It varies gradually with charge (until right at the end when it drops off) but also with temperature - so a cold watch will show a lower battery level than when it is warm.
There's a reason the default battery meter doesn't display a percentage - it's because it's really not that useful as far as indications go :)