Battery Mount Contact Components: Type - Batttery Contacts; Contact Pole - Negative; Contact Type - Spring Plate; Contact Material - Steel, Tin Nickel Plate; Battery Style - A, AA Cell; Mounting - Clip On Mount; Dimensions - 0.312" (7.9 mm) Width x 0.449" (11.4 mm) Height x 0.250" (6.4 mm) Expanded Length