BA300 BA 300 Battery for Sennheiser IS410, RI 410, RI 830, RI 830-S, RI 900, SET 830, SET 830-TV, SET 840-S, SET 840-TV, SET 900 TV Headphones Replacement for the Following Battery Model/Part Numbers: BA300, BA 300, BA-300, Cpp-523, HC-BA300, NCI-PLS100H, SENBA-300, 302716, 500898. Compatible with the Following Sennheiser IR and RF Wireless TV Headphones Models: IS410, IS410TV, IS410-TV, RI 410, RI 830, RI 830-S, RI 900, RR4200, RS4200, RS4200TV, RS4200TV-2, SET 830, SET 830-S, SET 830-TV, SET 840, SET 840-S, SET 840-TV, SET 900. 3.7V 140mAh 0.518Wh Lithium-Polymer Rechargeable Battery Pack. 1 Year Replacement Warranty. MPF Products is a Registered Trademark.