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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
Dear god no. You should never charge a LiPo battery without a charge controller - those have measures in place to prevent overcharging - that's very very important with lithium batteries, since they can catch fire when overcharged.
I think your best bet is what @gordon said. Note how he mentioned using a LiPo battery charger.