I'm not sure if this is too good to be true – but NanoTritium batteries, according to this article, can hold out 20 years under extreme conditions. That sounds like the perfect space backup power solution. I'd love for it to venture into consumer technology too, but it seems too expensive for that, starting at the several thousand dollar range.
NanoTritium battery is good for twenty years (or more)
(Phys.org) — Florida-based City Labs says it has created an adult’s thumb-sized, battery, NanoTritium, that can last 20 years or more in the most extreme conditions, such as extreme temperature and …
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