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Sennheiser Lithium-Polymer Battery for Assistive Listening Devices - Compatible with Set 840 (S)/830 (S)/900/IS 410/HDI 830/RI 410/RI 830 S/RI 900

The Sennheiser BA300 is a rechargeable lithium-polymer battery designed for use with the Set 900, RI 900, Set 840-TV, RR 840, Set 840 S, RR 840 S, Set 830-TV, RI 830, Set 830 S, RI 830 S, IS 410, RS 4200, RR 4200, HDI 830, RI 410 receiver. It provides up to 16 hours of operation on a full charge.