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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
Great! That all sounds fine to me - and you're sure that the battery voltage really is dropping out - like the protection circuitry is disconnecting it?
Could it just be that there's some issue with the control board which means that the battery hasn't charged fully? The auto-disconnect in those batteries can trigger because of overcurrent or low voltage