Replacement Ni-MH 3.6V 700mAh / 2.52Wh Cordless Phone Battery for RADIO SHACK CLTU30. This high-quality battery, with dimensions of approximately 45.90 x 31.20 x 10.70mm, is also compatible with Radio Shack models CLTU20 and CLTU22. Restore full talk time to your device with this reliable power source!