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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
What version of Puck do you have? It should say just behind the battery.
Are you 100% sure you've got the battery around the right way? Sounds dumb but it's happened multiple times so far as there aren't clear markings :)
Also, did anything happen that might have caused it to fail? Big drops, water, connecting to something external that might be powered, etc?