YCM 3.6V 800mAh Ni-MH Cordless Phone Battery for AT&T 27910 GE 5-2522 5-2721 27990 21098 V-Tech 5822 ia5829 ia5839 ia5845 ia5849 High quality cordless phone battery. Overvoltage and Shortcircuit protection Type: Replacement Battery Chemistry: Ni-MH Voltage: 3.6V Capacity: 800mAh Designed to meet or exceed performance of original battery Package Included: 1x Battery