IDK about trillions of dollars, but it certainly would be expensive. The entire process appears to involve creating artificial diamonds in an environment where radioactive material has been gassified in order to capture it in the diamond structure.

All this for a battery that provides an (effectively) infinite microwatt supply.

The article tries to say that you could use this for a pacemaker (yeah right...) Really, this would only really be useful in something like a remote sensor where it can take a day/week/month to charge a capacitor that ultimately triggers report signal.

The article mentions space missions, but again, this is far less practical than doing something like an RTG.