this post was submitted on 07 Jan 2025
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The supercapacitor is not special here because of its fast (dis)charge, considering the 45 day runtime that is the opposite of fast. I am also amazed that they got the leakage so low. Anyway, the point is going to be the tiny size (where Li sucks) and easier handling completely discharged as well as no aging.
Logitech has/had a solar keyboard a while back that just ran on just a CR2032 (whatever the rechargeable kind is) and even without extra light it would last a long time on battery. Without a backlight keyboards basically don't use any power so a 2032 was plenty for it.
https://www.amazon.com/Logitech-K750-Wireless-Solar-Keyboard/dp/B005L38VRU
I've had one of these for a many years, and I really like it, although finding a replacement for the single ML2032 battery was quite a headache the first time it died.
It turns out that a popular mod for these was to disconnect the panels and replace the ML2032 for a regular old non-rechargeable CR2032. The keyboard uses so little power that it lasts several months with a single battery.
It does make you wonder what was the point of the solar panels in the first place. If you replaced them with single use batteries they'd actually last longer than the entire lifespan of the rechargeable battery 😂
Mine is about 15 years old, and it came with a dead battery. I just have to buy a new rechargeable one, and it's still working with that, so I have a 15 years old battery inside. I bought a 2-pack back than, the other one is still somewhere here in a box unopened. So it's not "several months" I'm close to "several decades" at this point.