LifeLines L.L. 2.4V, 800mAh, Cordless Home Phone Battery for AT&T BT162342, BT162342, BT166342, BT-166342, BT266342, BT-266342 (single) Battery Type: Ni-MH / Voltage:2.4V / Capacity: 800mAh Type: Replacement Battery / Reachargeable: Yes 100% Customer Satisfaction.