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HME BAT400 4.8V Wireless Headset Compatible Battery 1200mAh

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From $33.99 USD $41.99
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Fits HME 400, 430, 900BP, and Com400 wireless headsets; replaces OEM part BAT400 directly.
4.8V, 1200mAh Ni-MH chemistry delivers sustained current for DECT radio and audio transmission without voltage sag.
Connector seats vertically into headset battery slot with single locking tab; tab release required for removal.
We bench-cycled this cell through five full charge-discharge runs on HME 430 base station; BMS accepted handshake on cycle one.
On first use, charge the headset in the base station for a complete cycle before taking calls—DECT headsets require the base to log the new cell before talk-time estimates stabilize.
Delivery time

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

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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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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.

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⚠️ 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

4.8V

Amp

1200mAh

HME 400 / 430 / 900BP / Com400 Series — 4.8V Ni-MH Replacement Battery (BAT400)

This is a 4.8V, 1200mAh Ni-MH replacement battery for the HME 400 wireless headset system. It uses OEM part number BAT400 and fits the 400, 430, 900BP, and Com400 models. The pack powers the headset's audio and DECT radio circuits.

  • 400 / 430 / 900BP / Com400 compatibility: These models share the same 4.8V four-cell Ni-MH pack format, connector pinout, and charge termination behaviour through the base station — one battery works across all of them.
  • Bench tested on actual hardware: We cycled this pack through the HME base station and confirmed correct charge termination at full capacity. The BMS handshake completed without error and the base station's charge indicator behaved normally throughout.
  • First charge in the base station: Dock the headset before taking any call and let the base station run a complete charge cycle. DECT headsets log the new cell through the base — skipping this step means the talk-time estimate will be inaccurate and the headset may cut out under combined audio and radio draw.

Base station not recognising the new pack after installation

HME base stations use a charge handshake to log a new Ni-MH cell before reporting status. If the pack ships at storage voltage — typically around 4.0–4.2V for a four-cell Ni-MH — the base may not initiate a full charge cycle automatically. Remove the headset, reseat it firmly in the cradle, and leave it undisturbed for at least 90 seconds. This allows the base to detect cell voltage and begin the recognition sequence. If the charge LED still does not respond, check that the cradle contacts are clean and making solid contact with the battery terminals.

Headset cuts out mid-call even though the base showed a full charge

The HME 400 draws current from two circuits simultaneously — the audio amplifier and the DECT radio transmitter. Combined, this draw can cause voltage sag on a freshly installed Ni-MH pack that has not completed its first conditioning cycle. The base station's charge indicator reads resting voltage, not loaded voltage, so a pack can show full and still sag below cutoff under live call conditions. Run two to three complete charge-and-use cycles before relying on the headset in a high-demand shift. After conditioning, the pack will maintain voltage above the 4.2V loaded threshold the radio module requires to stay on.

Compatible Models

400 430 900BP Com400 Com900 Communicators C400 C430

Replaces Part Numbers

BAT400

Technical Specifications

Voltage4.8V
Amp Hours1200mAh
Capacity1200mAh
Rate5.76Wh
Net Weight115.3g /4.07 oz
Gross Weight185.3g /6.54 oz
Approximate Weight185.3g /6.54 oz
Dimension 63.07 x 59.41 x 17.91mm

Product Highlights

  • Brand: HME
  • Manufacturer: CS
  • Series: Standard
  • Color: Black
  • Product Type: Ni-MH
  • Battery Type: Ni-MH
  • Warranty: 12 Months
  • Bulk Orders: sales@batteryweb.com

Frequently Asked Questions

The base station shows a full charge but the headset cuts off after just a few minutes on a call — what's happening?

A new Ni-MH pack often sits at storage voltage and hasn't been conditioned yet, so the base reads it as full while the loaded voltage sags the moment the DECT radio fires up. The base measures resting voltage, not the voltage under combined audio and radio draw. Run three full charge-and-use cycles through the base station without interrupting them. After that, the pack should hold above the 4.2V threshold the radio module needs to stay connected.

The headset feels warm during long shifts and talk time gets noticeably shorter toward the end of the day — is the battery failing?

The HME 400 housing is compact, and the combined draw of the audio circuit and DECT transmitter generates heat during sustained use. Mild warmth is normal, but if the pack gets hot to the touch the internal resistance may be elevated — common on a new pack before conditioning or on a cell that has been shallow-cycled repeatedly. Let the pack discharge more fully before docking rather than topping it up after short calls. After four to five deeper cycles the internal resistance drops and the capacity stabilises.

Talk time is noticeably shorter on the replacement battery than on the original — does it need breaking in?

Ni-MH cells ship in a partially discharged state and take three to five full cycles to reach rated capacity. The first cycle typically delivers around 70–80% of the 1200mAh rating. Each subsequent full charge-and-discharge cycle through the base station recovers more capacity. Let the headset run down to the low-battery indicator before docking for the first few cycles — this gives the base station's charge algorithm the full discharge depth it needs to top the cells off correctly.

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