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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
That's strange - what's the voltage on the 3.3v rail when you're running off the battery? Does anything happen when you plug USB in again?
I do that pretty much every day though - Lithium cell connected via the battery connector, do something and then unplug USB. It always seems to work well for me...