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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.
@the1laz
The voltage would be good enough if you're just after a bit of warning that the battery is almost out. When the battery is getting low and the voltage starts to drop faster, you can have a rough idea of how much time you have left.