Thanks for sharing this. Having studied physics in college, but for a number of reasons was not able to finish my degree, I find these kind of things facinating. A couple quick updates in case you are wondering about developments in this technology.
The C14->N14+e of the original battery was pretty weak in power density. A group in Moscow made it 10X more power dense by using Ni63 as the radioisotope, making it powerful enough for satellites and pacemakers.
The one you would need would follow the scale up efforts of NDB's work. I do believe they want to use P238 and U232, but bonded and in small quantities to make them not usable for anything but a battery.
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