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A patato battery model which might not work....
proposé par martin
Many examples of the 'potato battery' are published online, some ready-made kits are even sold.
Some examples like this one propose to light up a small incandescent bulb. This seems extremely difficult to achieve and it is much more realistic to try to operate a small LCD display or a LED.

Patato battery with a LED (video)
proposé par martin
With a LED, it's easier!

Pour approfondir le thème

All about batteries in Wikipedia
proposé par martin
Batteries in the famous open source encyclopaedia.