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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
Well, that battery thing should work fine - and then I guess if you find that it doesn't power Espruino for long enough you could open it up later on. If you post some pictures we can tell you what to connect :)
About the batteries, there are some links here to ones that are all pre-soldered: http://www.espruino.com/Battery
The 18650 batteries look good - it'd be nice if we could find a holder that had the PHR-2 connector on it already :)