iClover 2PCS Cordless Home Phone Nicd Rechargable and Replacement Battery 2.4V 700mAh for BT-1015 Energizer: ER-P506, ERP506 voltage : 2x 2.4v Capacity : 700mAh Fit for models : Again & Again: STB-956, STB956 Battery Biz: B730, B-730