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Sennheiser SDW 30 Replacement Battery AHB732038T 3.7V 450mAh

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From $23.99 USD $29.99
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Fits Sennheiser SDW 30, SDW 60, DW 30 HS, and SDW 60 HS headsets; replaces OEM part AHB732038T.
3.7V 450mAh Li-Polymer cell delivers 1.67Wh; sustains DECT radio and audio draw in call center shifts.
Connector seats flat into the battery slot on the headset earpiece; locking tab clicks once fully seated.
We bench-tested this cell in the SDW 30 base cradle; BMS handshake completed on first cycle with no fault codes.
Charge the headset in the base station for a full cycle before taking calls—DECT platforms need one complete charge to log the new cell.
Delivery time

This product ships directly from our Manufacturer's Warehouse and is usually delivered within 7 – 10 business days to your doorstep.

Discount: As a thank you for your patience, enjoy 5% off on your order
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Fresh Battery, Worth the Wait

To provide the highest-quality replacement battery, we ship this battery directly from the manufacturer rather than from aging warehouse inventory. This means delivery may take a little longer, but it helps ensure you receive a fresh battery with better performance, a longer lifespan, and greater reliability.

Estimated delivery: 7–10 business days
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By continuing with your purchase, you acknowledge and agree to the estimated 7–10 business day delivery timeframe.
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Battery Care Tips

🔹 Getting Started

Charge your new battery fully before you use it for the first time. Over the next few charge cycles, run your device down to around 20% before you recharge—this helps the battery perform its best. After that, charge whenever you need to.

🔹 Keep It Healthy

Avoid letting your battery completely drain or staying plugged in constantly. Both extremes wear it out faster. Store the battery in a cool, dry place when you're not using it, since heat damages batteries quickly.

Delivery and Shipping

🔹 Most orders ship the next day, and we use FedEx, UPS, Purolator and other carriers to get them to you. Lithium batteries have to ship by ground only, not air or USPS. Make sure your address is right before you order, because if we have to send it back, you pay for shipping again.

Disclaimer

⚠️ Disclaimer: All product names, trademarks, and registered trademarks belong to their respective owners.

🔹 We use these names, brands, or model numbers only for identification and compatibility purposes.

Voltage

3.7V

Amp

450mAh

Sennheiser SDW 30 / SDW 60 Series — 3.7V Li-Polymer Replacement Battery (AHB732038T)

This 3.7V 450mAh Li-Polymer cell replaces the original AHB732038T battery in Sennheiser DECT wireless headsets. It fits the SDW 30, SDW 60, DW 30 HS, SDW 60 HS, and over 56 additional models in the SDW and DW headset range. The cell matches the original dimensions at 36.10 × 19.60 × 6.90mm, so it seats correctly in the headset housing.

  • SDW and DW series compatibility: These headsets share the same cell format, connector pinout, and BMS handshake protocol across the SDW and DW lines. One battery spec covers the full range because Sennheiser standardised the power cell across that platform.
  • Bench tested on actual hardware: We ran this cell through charge and discharge cycles on the base station. The BMS completed its handshake with the charging dock and the charge indicator progressed normally through each stage without fault flags.
  • First charge on a new cell: Seat the headset in the base station and let it complete one full uninterrupted charge before taking a call. DECT headsets use the base station to log the new cell capacity — until that first cycle completes, the talk-time estimate displayed on paired software or the base may read inaccurate.

Base station not recognising the new pack after fitting

A replacement Li-Polymer cell ships at storage voltage — typically around 3.6V — not at the 3.7V nominal the BMS expects to see at the start of a charge handshake. Some SDW base stations respond to this by refusing to initiate the charge sequence or displaying a charge error. Reseating the headset once will usually clear this. If the base still shows an error, leave the headset seated for 10 minutes — the base trickle-charges the cell up past the BMS threshold before switching to normal charge mode.

Headset cuts out mid-call even with a new battery fitted

The SDW 30 drives both its audio circuit and the DECT radio transmitter from the same 3.7V cell simultaneously. During a call, that combined draw can cause brief voltage sag in a cell that has not yet been conditioned. The BMS reads the sag as an undervoltage event and trips the protection circuit, cutting the headset off. This behaviour typically resolves after three to five full charge and discharge cycles as the cell reaches its rated capacity — do not mistake it for a faulty unit after the first use.

Compatible Models

SDW 30 SDW 60 DW 30 HS SDW 60 HS SDW 5066 SDW 5065 SDW 5064 SDW 5063 SDW 5036 SDW 5035 SDW 5034 SDW 5033 SDW 30 HS SDW Pro 1 SDW Pro 2 IMPACT SDW 30 HS IMPACT SDW 60 HS IMPACT 5033 IMPACT 5034 IMPACT 5035 IMPACT 5036 IMPACT 5063 IMPACT 5064 IMPACT 5065 IMPACT 5066 MB Pro IMPACT DW 10 PHONE 10 USB ML EU 20 PHONE 30 HS 30 PHONE 30 USB ML EU Office Office ML Office USB Office USB ML Pro1 Pro1 ML Pro1 USB Pro1 USB ML Pro2、Pro2 ML Pro2 USB IMPACT MB Pro 1 Pro 1 UC Pro 1 UC ML Pro 2 Pro 2 UC Pro 2 UC ML EPOS GSP370 EPOS SDW 30 EPOS SDW 60 IMPACT SDW 5066 IMPACT SDW 5065 IMPACT SDW 5064 IMPACT SDW 5063 IMPACT SDW 5036 IMPACT SDW 5035 IMPACT SDW 5034 IMPACT SDW 5033 SDW 5000er

Replaces Part Numbers

AHB732038T 1000807 AHB732038TPCT

Technical Specifications

Voltage3.7V
Amp Hours450mAh
Capacity450mAh
Rate1.67Wh
Net Weight9g /0.32 oz
Gross Weight34g /1.20 oz
Approximate Weight34g /1.20 oz
Dimension 36.10 x 19.60 x 6.90mm

Product Highlights

  • Brand: Sennheiser
  • Manufacturer: CS
  • Series: Standard
  • Color: Black
  • Product Type: Li-Polymer
  • Battery Type: Li-Polymer
  • Warranty: 12 Months
  • Bulk Orders: sales@batteryweb.com

Frequently Asked Questions

The base station shows a full charge but the headset cuts off after a very short time — is the battery faulty?

Not necessarily. A cell at storage voltage can read as fully charged on the base indicator before it has completed a proper conditioning cycle. The base station's charge estimate is unreliable until the new cell has gone through at least one full charge from near-empty. Run the headset until the base signals low battery, then charge it fully without interruption — repeat this two to three times and the cut-off behaviour should stop.

The headset feels noticeably warm after extended calls — is that a problem with this cell?

The SDW 30 housing is compact, and the combined draw from the audio circuit and DECT radio transmitter generates heat in a small space. Some warmth during long calls is normal for this headset class. If the headset becomes hot enough to be uncomfortable, the BMS thermal protection may trip and cut the call — in that case, let the headset cool for five minutes, reseat it in the base, and the BMS will reset.

Talk time is noticeably shorter after switching to this replacement — will it improve?

Li-Polymer cells deliver their rated 450mAh capacity after a few conditioning cycles, not on the first use. For the first three to five cycles the cell typically delivers 85–90% of rated capacity as the electrolyte fully activates. Cycle the headset through complete charge and discharge sequences without partial top-ups during that break-in period, and talk time should reach the rated level by the fifth cycle.

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