350mAh BAP 800 Battery for Sennheiser Flex 5000, RS 5000, Set 880 Headphones - Walmart.com
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Wireless Pro Replacement battery for Sennheiser Headset OfficeRunner 504374 - Walmart.com
Amazon.com: 504374 Battery Replacement for SENNHEISER OfficeRunner DW Office DW Pro 1 DW Pro 2 SD Series Wireless Headset 504374 BATT-03 : Health & Household