• What clock face are you using? Those can have quite a big effect - for instance Slope Clock which updates once a minute still uses quite a bit of power because it's animated.

    In order of power consumption (there are some figures at https://www.espruino.com/Bangle.js2#powe­r-consumption):

    • GPS
    • LCD backlight
    • Compass
    • Heart rate
    • Bluetooth connection

    GPS is a massive power draw, so yes, if you have it on the battery will flatten quickly - there's not really a way around that.

    So to get the absolute best battery life, you want:

    • A non-animated clock that updates once a minute
    • 'Wake on twist' turned off
    • Ideally no (or 10 minute) heart rate sensing

    I have a bunch of watches here that I use for development, and for the ones sitting on the desk (especially if they just have the factory apps on) I reckon I must get almost 2 months


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