The deposits have to dissolved from the battery rods, and it’s not easy. You should use a mixture of Epsom Salt and distilled water for above. Batteries have a certain life span and as they cross the mark, there is a distinct loss in capacity to hold a charge. This method involves adding pure water, sodium sulfate, potassium sulfate, and other chemicals to the batteries. If it is reading under 9.6V, the battery isn't fully reconditioned, and you should repeat the steps. Batteries can be very da...