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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
Yes, it's totally fine, see: http://www.espruino.com/Pico#battery
It's got circuitry in there to safely switch between USB power or battery power as needed - just make sure you don't put too high a voltage on it, but if you're anything below 10v you're totally safe.
It's the same on both on the Pico and Original Espruino. The Espruino WiFi doesn't have any battery switchover circuitry though.