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The battery is 10 years old. The battery has 4 closed cans and 2 almost working ones. I will try to wash the cans with a soda solution and see the result of the wash. I measure the density of the electrolyte, the temperature of the electrolyte, wash the battery with a soda solution, wash with distilled water, fill the electrolyte, charge the battery. Result - Do not do any washing - only popular bloggers can do it. What's the point of washing if the positive plates have crumbled!