HQRP Battery 2-Pack for Sennheiser BA150 BA151 BA152 A200 HDI302 IS150 IS300 IS380 RI150 RI300 RI500 Headphones Receiver + Coaster HQRP&reg; Two Rechargeable Batteries Replacement plus HQRP&reg; Coaster; Battery Voltage: 2.4V; Capacity: 80 mAh; Ni-Mh; 200 Days warranty!