Battery Energizer 9v 175mah

Type of cell: Rechargeable Nickel-Metal Hydride (NiMH) accumulator.
Designation: HR22 (according to the IEC designation) or 6LR61.
Nominal voltage: 8.4 volts.
Nominal capacity: 175 mAh.
Typical weight: Approximately 42 grams.
Typical volume: 22 cm³.
Terminals: "Snap" type (clip-on).
Rechargeability: Can be recharged hundreds of times.
Low self-discharge: The battery holds its charge for several months when not in use.
Technology: Pre-charged and ready to use.