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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
Ok, it's possible you may get a slightly better fit by running the code while the watch is still on the charger?
But I think probably once it gets down to 10% you need to be thinking about getting it on charge anyway. While it might last a few days longer I imagine it could turn off pretty much any time if there was a high power draw (eg GPS)