2.1V and 20mA later...


You're looking at a red LED being lit by an ice cube tray battery (it's at the top). We finally got it working. Turns out we were using too much salt in the saltwater solution. The voltage drop is 2.1V where the LED is inserted.

Click on the picture to see a bigger version of it.
If you put enough of these in series, you could light a slightly larger LED or possibly a Toyota Prius.











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