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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
The difference may well be down to what I'd said above - just interference. I know I've noticed that just having me touching an IO pin that is an input is enough to drastically increase power usage - so perhaps even having your phone closer to the board can do it.