The MP-FRB is a replaceable battery pack for the Model MP7 located in the rear of the unit. The Battery is a: Sealed, rechargeable NiMH (Nickel Metal Hydride) cells consisting of 6 batteries at a voltage of 7.2 V dc with a capacity: 2.7 Ah.
Charging a depleted battery pack can be recharged in approximately six (6) hours, with a length of operation of more than two (2) hours when fully charged and with backlight on. When backlight is turned off, the unit can run continuously for more than three (3) hours.
Suggested replacement interval: Two years