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Do you still have the battery?

I am at risk for being censored again here for what I am about to tell you.

Have you looked into a Bedini motor or battery pulse desulfator?

Both can desulfate a lead acid battery, bringing it back into usable condition.

The Bedini motor you can easily make yourself at home using scrap materials.

I haven't been at the back of the hose to see the battery but I think it can be revived @thediyworld