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Coins of that level of copper should work fine. Your water needs to be acid though. It needs to be water-vinegar mix or water-pure lemon juice mix (Jif juice works fine). The water only needs to be a bit acid for you to get a voltage. After that you can experiment to see:Hey Timeshifter,
I tried to replicate the "battery" with the materials below but I can't get anything out of it. I put in water before the attempt too.
Euro cent coins are only 89% copper so maybe that's the problem?
- What difference the water-vinegar ratio makes to available voltage
- What difference the water-vinegar ratio makes to available current
Edit: Just saw those are magnets... forget my advice above unless you are using copper coins and milk bottle tops