MPF Products 180mAh 3.7V 0.67Wh Li-Polymer Battery BATT-03 504374 AHB401835T telephone accessory

Replacement Battery for Sennheiser Headsets

This lithium-polymer pack replaces the original AHB401835T, BATT-03 or 504374 cell used in Sennheiser DW Office, DW Pro, MB Pro, OfficeRunner and SD series wireless headsets. It restores talk time for office professionals who rely on these models daily. The 3.7 V 180 mAh 0.67 Wh rating matches the factory specification.

Check Your Headset Model Before Ordering

Verify the exact model name on your headset or base station against the supported list: DW Office, DW Office ML, DW Pro1, DW Pro2, DW Pro2 ML, MB Pro 1, MB Pro 2, OfficeRunner, SD Office, SD Office ML, SD Pro1, SD Pro1 ML, SD Pro2, SD Pro2 ML. Confirm the original battery part number is AHB401835T, BATT-03 or 504374. Other Sennheiser models use different packs and will not fit.

Compact Pack with Direct Connector Fit

The slim lithium-polymer pouch slides into the existing battery compartment without modification. Its integrated connector aligns with the headset's socket for a secure, polarity-correct connection. No soldering or adapter cables are required. The sealed construction resists swelling and maintains stable voltage through repeated charge cycles.