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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.
@AkosLukacs
LiFePO4 would be better, because it's safer, and it's maximum voltage is 3.65V, so you can almost fully charge it, and use it without an additional regulator. Usually more charge cycles compared to LiIon.
Drawback: smaller capacity at 0 charge cycles & couldn't find a small mass produced charger board. But if anybody knows one, drop in a link!