Replace or Reset Your OfficeRunner Battery | Sennheiser Wireless Guide - YouTube
Amazon.com: Genuine Sennheiser Replacement Rechargeable Battery for OfficeRunner Wireless Headset DW Office DW Pro1 DW Pro2 SD Office SD Pro1 SD Pro2 MB Pro series Li Polymer 205mAh (2 Pack) : Electronics
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