I saw a blurb in the Product Report/ Maintenence section of the June 2004 Dockside Northwest magazine which discussed this liquid additive. It is supposed to extend battery life by "desulfating" the battery plates so the lead can interact more efficiently with the acid. It's not very expensive $13 for a 6 oz. bottle which is enough for two 12v. starting batteries (1/2 oz. per cell) or one deep cell battery (one oz. per cell). The article also claims that you only apply this stuff once during the life of the battery. Anyone have any experience with this product?