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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.
@DrAzzy
18650's would be my choice, with that much space. In parallel, I think, because that simplifies charging...
Don't get the high current ones like they use in ecigs - you want the normal protected ones, so an accidental short doesn't involve as much smoke. They're cheaper too.