URPOWER&reg; 3 Pack Cordless Home Phone Battery for BT-17333 BT-27333 CS2111 CS5111-2 CS5121 CS5121-2 Ni-CD 3.6V 600mAh Batteries are made with the highest quality materials Short-circuit protection.It is very safety! Capacity: 600mAh,Voltage: 3.6V Battery Type:NI-CD 100% compatible with original manufacturer equipments and chargers High Quality cells that meet original Battery