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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.
@Gordon
To make something like the solar panel battery truly long life, you could crack it open and connect straight to the battery inside - as Espruino will be totally happy running off 3.7v
Often even when you do get the packs running, the power supply in them isn't very efficient when not supplying much power, and they don't last as long as you'd expect.