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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
Once it's open you have to glue it back together (probably a silicone based glue is best) but yes, it's not really designed to be opened.
We don't stock replacement batteries but the battery itself is a XK302627 (which means a 3 x 26 x 27mm) any LiPo you can get that's that size or smaller will work.