Replacement 3.6V 700mAh Ni-MH Cordless Phone Battery for AT&T E191937. Bring your cordless phone back to life with this high-quality battery. Capacity: 700mAh / 2.52Wh. Chemistry: Nickel-Metal Hydride (Ni-MH). Dimensions: 45.90 x 31.20 x 10.70mm. Compatible with various AT&T models including E191937.