Nuclear Diamond Batteries

Now I've seen everything!

This video came across my youtube feed today, and I just started geeking out over it:

Using the carbon from spent nuclear waste to power low consumption devices for up to 28,000 years? That's the stuff of science fiction and I love it!

Like the video mentioned, it's not going to replace the AA batteries we have in our TV remotes, nor will we be able to power cars with it. The power output is measured in microvolts, making it far more useful for things like IoT devices or sensors/detectors. But even so, this is a huge breakthrough! Now there's a use case for spent nuclear fuel besides sealing it in underground caverns for centuries until the radiation goes through enough half life cycles to not be a threat anymore.

What do you think? Neat tech? Overhyped?