Genuine Battery for the OfficeRunner from Sennheiser | Headsets.com
Sennheiser D10 DW Office DW Office ML DW Pro 1 DW Replacement Battery: BatteryClerk.com
CameronSino for SENNHEISER D10 DW Office DW Office ML DW Pro 1 MB Pro 2 OfficeRunner Pro 1 Pro 2 SD Office ML BATT 03 battery|Mobile Phone Batteries| - AliExpress
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)