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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
Just to add - not sure if you've seen these but you can get 18650 cells with a micro USB charger built in, for instance: https://www.ebay.co.uk/p/NITECORE-NL1826R-Micro-USB-2600mah-18650-Battery/18010225703
If you do another build it might mean you can avoid having to cram a charger board in there as well (although the positioning of the micro USB could be a pain).