9V battery also known as PP3, HR22, MN1604, BLOC, 6LR61, 1604AU, X22, 1604, 1604A, 1604AC, 4022, 522, 6AM6, 6F22, 9VOLT, A1604, CLR6, K9V, KA9, ND65V, R22, RB100890 etc. The size of the 9v battery is 55mm 52mm 17mm, which is compatible for 9v devices.
eBay