Vtech CS6129-41 Cordless Phone Battery Replacement for Vtech BT275242 Cordless Phone Battery Replacement Battery for Vtech BT275242 NICD, 2.4 Volt, 600 mAh. 100 percent compatible with your OEM battery. Made with high quality Chinese cells. This replacement 2.4 volt 600 mAh Nickel Cadmium battery fits the Radio Shack - 43-271 Cordless Phone and meets or exceeds original manufacturer specifications