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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
Well, don't take my word for it - look them up and see what it is :) It might be ok if you get decent ones.
Something like this could be good though. 9000mAh, and <1%/year self discharge!
I could be wrong, but that'd handle Espruino being on for 18 months, 2% of the time. So that's if it were awake for 0.5 sec, every 30 seconds - which seems like serious overkill.
I'd prototype something and do some power consumption tests though :)
non-rechargeable, but hey - £5 every 18 months isn't a disaster