Sarah Clark, Director of Tritium Fuel Cycle at UKAEA, emphasized the sustainability and safety of this innovation, saying, “Diamond batteries offer a safe, sustainable way to provide continuous microwatt levels of power. They are an emerging technology that uses a manufactured diamond to safely encase small amounts of carbon-14.”

(emphasis mine)

Still, I imagine this could be useful for very specific low power applications.

I wish there were some paper available, other than this press release.