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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
Oh yes! There's http://www.espruino.com/Puck.js#power-consumption if you're interested.
The Puck has a ~200mAh battery (depending on what's there) so divide 200,000 by the uA figures there to get an idea of hours.
With the default advertising you're looking at around the 200 day mark - higher TX power will reduce that, but making it nonconnectable and nonscannable (if you don't need it) will get you some of that back.