Sennheiser BA300 Lithium Polymer Rechargeable Battery For Sennheiser Set 900, Set 840, Ri 900
The BA300 from Sennheiser is a rechargeable lithium-ion battery designed for use in the Sennheiser Set 900, RI 900, Set 830-TV, RI 830, Set 830 S, RI 830 S, IS 410, RI 410, RS 4200, RR 4200 systems