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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.
@ajkm
Battery drop off sounds similar to a LiPo - fast discharge to nominal voltage, then gradual discharge, ending with rapid falloff to zero. I had the same today - 25% or so, then the next time I looked, the watch had turned off. It would certainly be handy to have a "critical battery level" warning or something similar.