Sennheiser DW Office / SD Office / OfficeRunner / Pro1 / Pro2 Battery Dying? Replace BATT-03 Instead of Buying a New Headset

Sennheiser DW Office or SD Pro headset dying after 20 minutes? Don’t replace a $200+ DECT system—swapping the BATT-03 Li-Po cell is simple, cost-effective, and restores full-shift talk time.

If your Sennheiser DW Office, SD Office, OfficeRunner, Pro 1, or Pro 2 wireless headset:

  • Drops out unexpectedly during Teams, Zoom, or VoIP calls
  • Shows a green LED but shuts down after just 20–30 minutes
  • Fails to hold a charge when docked on the base cradle
  • Delivers only a fraction of its original all-day talk time

…the headset itself is not broken. The internal 3.7V Li-Polymer battery (OEM BATT-03 / 504374 / 1000726) has simply aged out after 18–36 months of daily docking cycles.

STARNOVO keeps this dedicated office headset replacement cell in continuous production:

Compatible Replacement: 3.7V Li-Polymer BATT-03 / 504374 Replacement Battery for Sennheiser DW Office, SD Pro & EPOS Headsets

1. What Battery Does the Sennheiser Office Headset Use?

Technical specifications for the OEM-spec replacement cell:

  • Voltage: 3.7V
  • Capacity: 280mAh
  • Chemistry: Lithium Polymer (Li-Po)
  • OEM references: BATT-03, 504374, 1000726
  • Cell reference codes: AHB401835T, AHB401835TPS
  • Safety features: Built-in PCM protection circuit against overcharge and short circuits

2. Supported Sennheiser & EPOS Headset Models

The STARNOVO BATT-03 replacement is engineered for the complete Sennheiser office / DECT ecosystem:

  • DW series: DW Office, DW Office ML, DW Pro 1, DW Pro 2, DW Pro 30
  • SD series: SD Office, SD Office ML, SD Pro 1, SD Pro 1 ML, SD Pro 2, SD Pro 2 ML
  • D & MB series: D10, DW10, DW20, DW30, MB Pro 1, MB Pro 2
  • Special editions: Sennheiser OfficeRunner, Pro 1, Pro 2
  • EPOS line: EPOS IMPACT DW and SD series wireless office headsets

Verification Tip: Open the battery compartment or earcup shell before ordering to verify your existing battery is labeled BATT-03 or 504374.

3. Sennheiser BATT-03 Battery Swap — Field Guide

Difficulty level: 4–6 out of 10. Some models feature a dedicated slide-out battery compartment; others require gently prying the earcup perimeter clips using a plastic spudger.

  1. Power the headset off completely and remove it from the charging base.
  2. Open the battery compartment door or gently separate the earcup shell using a plastic pry tool.
  3. Disconnect the old Li-Po cell from the miniature white circuit board connector.
  4. Plug in the STARNOVO 3.7V 280mAh replacement cell, taking care to match connector polarity.
  5. Seat the cell neatly into its internal retention recess without pinching lead wires.
  6. Reassemble the earcup shell until the retention clips click firmly into place.
  7. Dock the headset on its base station and complete a full initial charge cycle before use.

Pairing Tip: If the headset does not link immediately after installing a new cell, perform a base station reset per your user manual. An old deep-discharged cell can leave the DECT radio in a freeze state that a quick reset clears.

4. When a New Battery Won't Solve the Issue

Skip the battery swap if your headset setup exhibits any of the following hardware faults:

  • No base power: The base station power LED does not light up when connected to AC power.
  • Persistent pairing failure: Headset fails to pair to a verified working base even after multiple manual resets.
  • Physical socket damage: The white connector socket is burnt, corroded, or the boom microphone wiring is severed.
  • DECT radio breakdown: The DECT RF module has failed (constant roaming tone, zero wireless range).

These issues stem from base station or circuit board component failure rather than battery cell wear.

5. Why Call Centers & IT Teams Choose STARNOVO BATT-03

  • Exact OEM architecture: Genuine 3.7V / 280mAh Li-Po form factor engineered specifically for Sennheiser office frames.
  • Integrated PCM circuitry: Built-in protection against overcharge, over-discharge, overcurrent, and short circuits.
  • Certified compliance: Fully tested and certified under UN38.3, IEC62133, UL 2054, and RoHS safety benchmarks.
  • Full-shift runtime restored: Restores full ~8–12 hour talk time for BPO, contact center, and hybrid workforces.
  • 12-Month warranty: Complete product reliability backed directly by STARNOVO.
  • Fit verification by photo: Email a photo of your existing battery label to our team for confirmation within 24 hours.
  • Enterprise bulk supply: Dedicated volume inventory and wholesale pricing available via sales@starnovo.com.
Get the Sennheiser BATT-03 Replacement Battery →
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