After searching on "homemade batteries" only one thread came up. Very ineteresting stuff on Aluminum/stainless cell.
I've started on several solar & wind turbine systems only to hit the wall when it came to the price of storage batteries. Many folks make their own alternators or generator and wind turbines. i haven't found any folks actively building their own cells/batteries. Well, i'm trying. I'm trying conduit (zincplated steel) and copper tubing, with an alkaline electrolyte. I'm to the point where i've made several cells and will be filling and joining in series, then for the amp/hour (could be milliamp/minute or second?) testing, who knows? Anyway i'm doing it. We'll see shortly.

Anybody out there build their own cells?

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i've learned much since then.