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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
Sorry about that - I'll check if it got marked as spam or something.
But yes, all the 3.6/3.7v batteries are going to be Li-ion/Lipo which have the kind of discharge curve you see attached (image from https://www.dnkpower.com/lithium-polymer-battery-guide/) - so unfortunately just a little too much voltage.
But those ML2032 should be just the ticket (although each one is 65mAh vs the ~@220mAh for a CR2032 so will need changing more regularly). You'll just have to be careful you get the right charger for them. I guess you might be able to put a connector on the Puck and then charge it up without having to take the battery out, which would be a neat addition.
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