Replacement Ni-MH Battery for Uniden 6807 Cordless Phones (3.6V, 700mAh). Restore the talk time and standby performance of your Uniden 6807 and compatible models with this reliable 3.6-volt Nickel-Metal Hydride battery, featuring a 700mAh capacity. Exact dimensions: 45.90 x 31.20 x 10.70mm.