Sulfation 1 (Battery) : The formation of lead sulfate of such physical properties that it is extremely difficult, if not impossible, to reconvert it to active material
Young & Company Electric Power Products and Related Engineering Services, Glossary of Electrical Terms, http://www.youngco.com/young2.asp?ID=4&Type=3, CA., USA 2001. (Electr Sfty - Amer) {514}