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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.
@maze1980
A charger for LiPo goes up to 4.2V (and more), a charger for LiFePo4 would go up to 3.6V or max. 3.75V which could be acceptable. You'd need a different charger and a LiFePo4 battery, too. And since there's no voltage regulator involved that would fail at at low battery voltage should detect low battery voltage yourself. Otherwise the chip would drain the battery until it's dead and broken.