Half a croissant, on a plate, with a sign in front of it saying '50c'
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I didn't say you were on to something, I said you were on something.

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sugar powered battery

a battery powered by sugar (grind sugar and pour water over it)
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A regular small sized battery powered by sugar.

Inside the battery is a tiny digestive system that slowly burns the sugar and outputs a stable charge. I suppose a chemical system would be the best but am not rulling out a tiny mechanical generator. Part of the battery of course is a regular battery used as a buffer and for storage (like in a hybrid car).

The first ones will cost a mint, but the next ones will replace the current batteries that have a shelf life of 2 years.

Written after my laptop died within 3 minutes out of the charger. Arrrrrrrgh!!!

pashute, Jan 25 2022

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       Does my daughter fit the bill?
RayfordSteele, Jan 25 2022
  
      
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