Replacement Ni-MH Cordless Phone Battery for LUCENT E2901 (700mAh, 3.6V). Restore power to your AT&T/Lucent compatible cordless phone with this brand new, long-lasting Ni-MH rechargeable battery. Features 700mAh capacity and 3.6V output. Dimensions: 45.90 x 31.20 x 10.70mm.