Radioactive diamond batteries

[Ayahuasca]

http://www.sciencealert.com/scientists-are-turning...

Sound a good idea.

I see it is being developed by a UK university. Let's see who develops commercial applications and makes billions. My guess is that it won't be a Brit.

[Toltec]

If my calculation is correct a kilogram of C14 will produce 80mW and that does not include the mass of the diamond encapsulation. I wonder how long it will take to recover the energy needed to produce the battery in the first place?