Replacement Battery for Sennheiser Wireless Headsets (Office, Pro1, Pro2)
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
Merritt Compatible Replacement Battery for Sennheiser Officerunner, DW Pro, MB Pro and SD Pro Wireless Headsets - Walmart.com
AKKU 30096: Battery for Sennheiser DW Office, Li-Po, 180 mAh at reichelt elektronik