well this is exciting. it's a nuclear battery, and it comes in a DIP package. lasts around 20 years, only $4500 for the 2.4V model.

there are a few caveats...
fits in a standard breadboard, how convenient
looks like you used to be able to get it from AliExpress. yeah, that's believable.
and SparkFun used to sell a kit! https://www.sparkfun.com/products/retired/14773
Nuclear Battery Kit (Bring Your Own Tritium)

After we caught sight of [some very cool folks](https://hackaday.com/2016/12/01/make-your-own-nuclear-battery/) online making their very own homemade nucle

https://www.sparkfun.com/products/retired/14773
time to hit the book
the book was published in 1964, so yeah, cold war.
here's a cute little Sr90 nuclear battery. complete with a cross section diagram.
(oops, Sr80)
probably is actually Sr90, book has a typo
"in external appearance, the krypton battery looks very much like a conventional chemical dry cell."

just one of the many terrifying phrases on this page
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