• 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

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