The Fluke BP7235 is a rechargeable Ni-MH battery. Its compatible with the Fluke BC7217 battery charger unit.

Description: 7.2V 3500 mA-hour rechargeable Ni-MH battery pack.
Application: Provides typical 16-hour battery life when used in 700 or 740 Calibrator.
Included: One battery pack.
Material: Six 1.2V dc Ni-MH cells in custom-molded ABS/PC-blend case.
Application: 7.1" x 2.2" x .9" (150 mm x 56 mm x 22 mm)
Dimensions: 7.1" x 2.2" x .9" (150 mm x 56 mm x 22 mm)
Weight: 11 oz/310g
Warranty: One year