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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
You could try connecting with the Web IDE and typing
E.getBattery()- also I believeanalogRead(D3)gives you the raw value - usually 0.3ishDoes the battery still seem to last a long time? It's just that you can't see the percentage?