Coin-sized nuclear 3V battery with 50-year lifespan enters mass production
(www.techspot.com)
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In saw a nuclear batter about the size of a 25 gal hot water tank. It was a replica of the none in the space station that powers and heats it. It's solid state and last aboitn75 years in that application. Was told you could build them bigger or smaller. Bury them in control Crete and power a couple hundred times for 50 years on one battery. This was ten years ago I saw this.
I don't think the ISS has RTGs on board. Maybe you're talking about the Mars rovers ?
No RTG on ISS. Here's the full scoop: https://en.wikipedia.org/wiki/Electrical_system_of_the_International_Space_Station