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100mW probably enough to idle a sizable % of phones on. One could definitely make a low powered phone that slowly recharges a super capacitor or regular battery while idling. Basically use the nuclear battery like a range-extender in a hybrid car, dumping power in, but not driving the phone.

100mW is probably enough indeed, but the battery in the source only does 100uW.

not a very high quality source article indeed, first paragraph: "A Chinese startup has unveiled a new battery that it claims can generate electricity for 50 years with the need for charging or maintenance."

wauw, a battery that needs charging.

did they even read what they wrote?

Unless it's a perfectly legitimate output of ChatGPT or the likes.