This was a "conspiracy theory" until it is now a commercial product and proven fact! The begining was the RPG nuke batteries from the 50's which are very clumsy and out of date. They power space probes with thermoelectrics from decaying radioisotopes such as polonium and plutonium. This battery uses the more natrual and benign isotope called tritium, an isotope of hydrogen. The battery lasts 20 years and is ideal for powering sensors. I have heard of a similar betavoltaic technology from some German hackers. Will post that stuff soon. Here is the links to the 20 year batteries !
atomic battery
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