A simple classroom (no soldering) project  to show aluminum air batteries in 
use. In this instructable I will show you how to create a simple 3 cell 
aluminum air fuel cell using household aluminum foil and saltwater. You can use 
this to drive a small light or possibly a motor. This device will function for 
extended periods as long as the fuell cell is periodically recharged with 
electrolyte and the aluminum foil is replaced when power output drops below 
acceptable levels.

http://www.instructables.com/id/Salt-Water-and-Aluminum-Foil-Night-Light/

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