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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
Also worth adding - are you using it until the battery level is 0, or until it turns off?
Because it can be in some watches that the battery level indicator isn't calibrated right - but recalibrating it with the 2v13 firmware is pretty straightforward