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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
Right, a new one is in the post back to you now, and it's been tested running off the VBat pin.
On the rev 1v3 Picos it's worth making sure you don't short out or draw too much power (over about 300mA) from the 5v output pin. It seems something like that killed the diode taking power from USB which caused the board not to work off USB power any more.
When you do power the board from an external power supply I'd either make sure:
Depending on the power supply you use, connecting the + volts before ground could cause upwards of 100v to go through the Pico's input pins - which obviously there's no way it can be designed to take.