Replacement Ni-MH 3.6V 700mAh battery for Northwestern Bell 35828 Cordless Phones. Exact specifications: 3.6 Volts, 700mAh/2.52Wh capacity, Ni-MH chemistry, and dimensions of 45.90 x 31.20 x 10.70mm. Compatible with models 35828, 35829, and others. Restore your phone's talk time!