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Step 1: Materials
Nails (zinc coated)
Alligator clips with wire
Scrap copper wire
No film canisters? You can use a cup with plastic wrap over the top. That is the way we did it the first time. Works almost as good. We also sell the film canisters at catsscience.com but you maybe able to get them cheaper from e-bay.
No alligator clips? We used old speaker wire that we found. It works fine.
Step 2: Getting Copper Wire
Step 3: Making the Battery
Step 4: Connecting Batteries
Hook the "batteries" to one another by connecting the alligator clips. We will need to connect one canister to the other by copper wire to nail. The copper wire is acting as a positive and the the nail is acting as a negative. String 3 or more canisters together to get enough energy to light the LED.