Internal Impedance (Battery) : The opposition to the flow of alternating current at a particular frequency in a cell or battery at a specific state-of-charge and temperature
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}