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Battery from Deodorant & Pennies (rechargeable)
I remember making a project like this in grade school for a science fair.But some things I've learned over the years;any pennies made after 1982 are 92% zinc. But, they are coated in copper, so some sanding is required to sand them down. The vinegar, which has acid lets the metal flow as ions throughout the battery. The battery dies once all the potential energy is drained from it, not when the vinegar dries or anything like that. This is a chemical process. That being said, I'm NOT sure hooking up a solar panel can recharge these batteries. I'm looking into that as I type this...BUT one thing to be noted, I've seen other people build 10 cell batteries using the method I stated, and it lasted 2 1/2 weeks only powering an LED. That being said, there's no clue as to what happens when it's connected to a solar panel, as I haven't seen that applied to any of these batteries. It may be possible, but I have yet to find out. I'll update upon finding the result.
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