The Penny Battery

Step 4 Assemble

pick out two pennies and solder leads to one face on each of them, one with the lead on the copper face, the other with it on the zinc face.

Now start stacking coins and cardboard, with all the coins copper side up, stack them with a peice of soaked cardboard between, secure with a rubber band and attach the leads to a low current electrical device, the copper side is the positive. And Tool said "Let there be light".

Comments

[shadow4742]

so in terms of power, is it a AA, AAA, D, or what?

[knoxarama]

how long do you get out of these?

[samnew]

yeah i am wondering that as well, how long do you think it might run a LED?

[viper121]

Mine works great I added 2 pennies since pic and i am up to 4.5v open, 1.8v under load Oh and I don't have a lemon so I used salt water

[1oooop]

Isn't 6 volts enough to fry an LED? especially white ones(rated 3~3.2 volts[3.3 is okay])

[Tool Using Animal]

Yes, but that was "open circuit" voltage, under load it drops.

[1oooop]

ahh,yes.. forgot about that :P