About this replacement
Designed for Sennheiser, Williams Sound devices. Compatible models include SET-20, SET-820S, SET-810, SET-810S, SET-250, SET-250J, RI250, RI250-J, RI250S, HDI302, A200, RS-30. Replacement part numbers include BA150, BA151, WEST-BA151, BA152, BATAP97A. Key specifications: 2.4V, 60mAh, Ni-MH.