"With a power density per cubic centimetre of 10 microwatts"
"have emitted a prototype nuclear battery packing 3,300 milliwatt hours of energy per gram"
Hold on a mo. Something's not right. Either that's a fecking huge battery or it literally generates an absolute damn pittance of electricity that you could probably get from heat-capture of a human body / capturing stray Wifi.
Is 10 microwatts really all that useful?