Panasonic Attune II Genuine Battery WX-SB100 for the WX-CH455 WX-CH457 headsetPanasonic Attune II Genuine Battery WX SB100 for the WX CH455 WX CH457\ headset. > 10 hours of use True Panasonic battery Headset comes with sleeve to allow battery to be use in WX Z3040A battery charger Replace batteries every 6 months (recommended) Used with the HD3 Headset Rated voltage capacity : 3. 7 V DC 700 mA Battery type : Rechargeable Li ion Battery Operating ambient temperature Charging : +5 C to +35 C Operation : +5 C to +35 C Storage : 20