I was told years back, to drain a battery and purchase new acid, recharge battery and this will give new life to your battery. Has anybody used this and will it work or is this work or is this an old story?
I revitalized two5 year old 12 volt batteries like that but first washed out each cell upside down to remove the sediment. Added new electrolyte and they lasted another 7 count them 7 years. They were cheap autozone batteries. Did I mention I also sank them in my airboat?