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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.
@Mi
Another thing to check: I started to store the watch face down when not wearing it some time ago. At least in daytime then the heartrate monitor seems to "see" that its not worn through the light and doesn't use its LEDs anymore. That considerably improved battery time for me.
Of course this is a work-around. Better would be a real recognition (eg. via accelerometer, temperature, ...) and stop all sensors when not worn. Also a stamina mode would be good, stopping sensors below a battery threshold. (so lots of nice projects for software development :-)