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What is that battery? It looks like it will last about ten years, wouldn't a solar keyboard need a battery about 1/50th the size?

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To answer the battery life question, I estimate (https://github.com/cjshearer/cweep/issues/2) it will last ~228 days without the solar charger, and between between ~261 and ~337 days with the solar charger.

I acknowledge that that really isn't much of an improvement, so at this point the solar charger mostly exists "because it's cool".

Ah, that's too bad. Given how little energy this keyboard consumes, I was hoping it could run on the solar charger indefinitely. Hell, maybe a supercapacitor could be enough, hm.

EDIT: I think you've overestimated active power consumption, I don't know if you'd actively be holding down keys for 2.5 hours per day... Also you estimated using this for 11 hours a day straight, which seems like way too much.

That's a 10440 lithium ion cell. It's the size of a AAA battery. Probably bigger than the keyboard needs but they are cheap, standardized, and easy to source.

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