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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
Hi - which device are you using? Puck.js? And do you have up to date firmware?
The (measured) figures I have for power consumption are: http://www.espruino.com/Puck.js#power-consumption
So you'd expect 12uA if watching the button with no advertising, or around 25uA watching the button with advertising, which would be the default (there is no polling at all as the button monitoring is done with hardware).