Vtech CS6129-31 Cordless Phone Battery NICD , 2.4 Volt, 600 mAh - Ultra Hi-Capacity - Replacement for Vtech BT275242 Rechargeable Battery Replacement Battery for Vtech BT275242 - NICD, 2.4 Volt, 600 mAh. 100% compatible with your OEM battery - 3 year warranty. Made with high quality Japanese cells. Synergy Digital is a Registered Trademark