High Quality, high capacity, light weight rechargeable batteryNo memory effectCan be charged or discharged as needed without loss of capacityOvercharge protection, with built-in battery life microchipCE CertifiedCapacity: 850mAhDimension: 51.00 x 30.50 x 10.50mmCompatible Models: Plantronics CT11, CT12 Compatible Original Battery Part nos: 6342101