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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
The moment consumers started handling 18650's, they needed protection ;-)
You can buy these itty-bity protection boards on aliexpress that I think are what they stuff into the cells.
I'm also looking for a multicell charger IC - let me know if you find any - I have several ongoing projects whose charging setup I'd be much happier with if I could find.