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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 02 Apr 2025
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On/off isn't a problem, the batteries continuously produce energy but a mechanical switch can still toggle the connection to the device.
I was wondering would they have over-heating problems, but the energy is so small it can probably be dissipated elsewhere.