Replacement Battery for Olympia Birdy Voice Cordless Phone. This high-quality Ni-MH battery features a capacity of 700mAh / 2.52Wh and a voltage of 3.6V, ensuring reliable power and long talk time. Exact dimensions are 45.90 x 31.20 x 10.70mm, guaranteeing a perfect fit for your device. Restore your cordless phone's performance with this dependable replacement.