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Coin-sized nuclear 3V battery with 50-year lifespan enters mass production
(www.techspot.com)
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this post was submitted on 04 Apr 2025
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Squares have better packing efficiency. But I'm sure they'll make round versions. Button batteries are circles because they're so often used in device with round form factors.
Like PC motherboards and scales?
They're probably used about as often in non-round items than round. They're ubiquitous for anything that needs a small, constant, relatively long lasting power supply.