60mAh Ni-MH BA150, BA151 Battery for Sennheiser A200, RI250, RI250-J, RI250S, SET- 20, SET- 820S, SET- 810, SET- 810S, SET- 250, SET- 250J, HDI302, A200, RS-30, RS-40, RS-45, RS-65 High Quality, high capacity, light weight rechargeable battery No memory effect. Can be charged or discharged as needed without loss of capacity Overcharge protection, with built-in battery life microchip Compatible Models: Sennheiser A200, RI250, RI250-J, RI250S, SET- 20, SET- 820S, SET- 810, SET- 810S, SET- 250, SET- 250J, HDI302, A200, RS-30, RS-40, RS-45, RS-65 Compatible #s: BA150, BA151, WEST-BA151, CPH-522