TOPCHANCES(TM) Cordless Telephone Pack Replacement Battery for Vtech BT 17333 BT 27333 CS2111 3.6V 400mAh Ni CD Yellow 0.14 x 0.1 x 0.05 High quality and reasonable price. It has the function as same as original battery, but it's more of tangible benefits. The battery is very durable, it's safety and long time use. Compatible with original manufacturer equipments and chargers. Chemistry: Ni-Cd Voltage: 3.6V Capacity: 600mAh