[ninalanyon]

Reminds me of an old Nokia proof of concept charger for a mobile phone that used energy harvesting. It never was enough to make a call though:

From 2009 https://www.eetimes.com/nokia-working-on-energy-harvesting-h...

But it seems that the idea is still alive, from 2023:

"Relying more on ambient energy sources could prove monumental in automated warehouse inventory tracking, in medical instrument management and for deployment in airports, shopping centers and even individual smart homes. Nokia’s goal is to have energy harvesting technology in cellular networks that can support this massive IoT deployment."

https://www.nokia.com/blog/the-future-belongs-to-zero-energy...