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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.
@Nick_S
Thanks for the reply, that sounded very likely so I left it on charge for a couple of hours, and it's not gone off today. So far so good. I'll report back if not but seems all good so far.
Also, is there a link to recalibrate the battery or did you mean that once the battery charges properly the code in the firmware will auto fix it?