This 4V/5.0AH, 0800-0009 Battery uses 2 x Cyclon 0800-0004 cells used in series. Supplies with wire leads, it will keep your instrument fully operational.
0800-0009 Battery Specifications:
Voltage - 4V
Capacity - 5.0AH
Chemistry - Sealed Lead Acid
Dimensions - 3.46" x 1.73" x 2.87"