Vtech CS6729-2 Cordless Phone Battery Ni-MH 2xAAA J Connector, 2.4 Volt, 750 mAh - Ultra Hi-Capacity - Replacement for Rechargeable Battery Replacement Battery for Rechargeable - Ni-MH 2xAAA J connector, 2.4 Volt, 750 mAh. 100% compatible with your OEM battery - 3 year warranty. Made with high quality Japanese cells. Synergy Digital is a Registered Trademark