Yes, you can actually buy nuclear-powered batteries from online sellers in China for a whopping $2720. It's purported to last for 20-years without needing to be recharged and is made from nano-tritium. Researchers say that the amount of tritium extracted from 1L of sea water can release the energy equivalent of 300L of gasoline in one complete nuclear fusion. Continue reading for a picture of the actual battery and more information.
The battery is thumb-sized and designed for small devices, like pacemakers, sensors, and implants. Apparently, nano-tritium based batteries can already be found in signs, watches, and some types of glow sticks.