There's a brand-new, obscure way to bring nearly ANY dead battery back life again. I've already tried it with car, laptop, and phone batteries that were completely dead.
You can just replace your old batteries and save a lot of cash. https://mmatycoon.info/index.php/The_Forbidden_Truth_About_How_To_Bring_A_Dead_Lead_Acid_Battery_Back_To_Life_Unveiled_By_A_Classic_Professional