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Raspberry Pi is now manufacturing 70,000 Pi 5s per week, will surge to 90,000 in February
(www.tomshardware.com)
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Wouldn't you just use a cheap lithium ion battery I'm not sure why you go for a lead acid.
It's just an example, but you can pull an old car battery from the junkyard and they have better temperature extremes. NiMH from a wrecked hybrid is also a good option for durability.