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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.
Spocki
@Gordon
I missed @AkosLukacs post, but LiFePO4 looks good - and it may be ok with being trickle charged via a solar cell even without a charge circuit? you'd have to check the datasheet.
Other potentially more resilient cell chemistries are available too - for instance https://www.sii.co.jp/en/me/datasheets/ms-rechargeable/ms621fe/