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I have made several of these Alum batteries and use a inverter to plug in a lamp during power outages. Depending on how bad your battery is sulfated they work well, holds 11 volts for hours
Aluminium Sulfate Lead Acid Battery Conversion
I have seen this design before, people put a stirling engine on the end to make electricity. I think you could also make energy using Peltier modules but Im not smart enough to figure that out