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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.
@IanWatkins
Probably not much help, but I have run the main Espruino board, single I2C board for pressure, temp and humidity and NEO6 GPS all logging every second to microSD card for 24 hours (so little sleep) from a 1000mAh 3.7v LiPo with power to spare, though not much.
So assuming you can power down external kit while sleeping, battery requirements won't be huge I would have thought.