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Replacement BA300 BA 300 Battery for Sennheiser IS410, RI 410, RI 830, RI 830-S, RI 900, RR4200, RS4200, SET 830, SET 830-S, SET 830-TV, SET 840, SET 840-S, SET 840-TV, SET 900 Wireless Headphones - Newegg.com
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Amazon.com: Replacement for Sennheiser Set 830-TV Battery - Compatible with Sennheiser BA300 Headphone Battery (150mAh 3.7V Lithium Polymer) : Electronics
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