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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
Hmm, that's tricky since USB power on the Wifi board is connected straight to the main power pins.
The easiest would be to get a 3.3v switchmode supply and power the 3.3v line from the battery via that. You could then power the lipo charger from the Wifi power pin.
The other benefit is you can run the battery down further. If you'd just plugged a lipo in my guess is the Wifi would start to play up long before the battery was fully empty.