EBL Rechargeable Cordless Phone Battery for Panasonic P-P511 ER-P511 HHR-P402 4 Packs Packs :4 packs Panasonic P-P511 Ni-MH 3*AA 3.6V 1500mAh Battery Battery Type: Rechargeable Brand New Replacement Product, Works as Genuine Parts The Replacement Battery come with 30 days money back and 12 months warranty