It's a bit suspicious that the article doesn't actually mention how much power the system uses. The processor it powers doesn't need very much at all, so it makes one wonder
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From what I can find [0] it uses 11 uW per MHz. If I’m not mistaken, that means it could run 100 cores at 1GHz and still only use about 1 watt, which sounds almost as impressive as powering it with algae!
https://www.silabs.com/mcu/32-bit-microcontrollers/arm-corte...
Wow. thanks. Doesn't seem like it would replace all that much lithium then