When I take my foot off the accelerator in my electric car, the ‘regenerative braking’ process charges up the battery. Similarly if I’m going downhill. This is reasonably well-known now.
Well, I was talking to a friend today about his planned purchase of some high-tech hearing aids. They sound splendid, though they should do for the price. It would be cheaper to put two MacBook Pros in your ears… though perhaps a bit less comfortable.
Anyway, I was asking him about their battery life, and, pondering this topic later, I was thinking that you ought to be able to do something similarly clever there: if they use power to amplify things which are too quiet, could they also recharge their batteries by deadening things that are too loud? If you were out for a long day and they started to run down, you could simply head for a loud rock concert, or perhaps seek out a high-crime area and stand near some police sirens. Even if the recharging didn’t work very well, you wouldn’t be able to hear anything afterwards anyway, so you wouldn’t care.
Brilliant, eh? I’m off to the patent office…
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Some prior art for your patent: https://www.instructables.com/id/Harvesting-Sound-Energy-From-Passing-Cars/
(But not particularly impressive results)