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Avaya Tenovis HSG-Link DECT 2 Compatible Battery 3.7V 240mAh

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Fits Avaya Tenovis HSG-Link DECT 2 headset, replaces OEM part 65358-01, 64399-01, 64327-01.
3.7V, 240mAh lithium-polymer cell delivers the capacity this DECT headset needs for full talk and standby cycles.
Connector slots into the battery compartment behind the ear cup with single contact alignment — no polarity reversal possible.
We ran this cell through five charge cycles in the HSG-Link DECT 2 base station; BMS settled after cycle two with stable voltage under sustained transmission load.
On first use, charge the headset in the base station for one complete cycle before taking calls — DECT bases log new cells during initial charge, and talk-time estimates stay inaccurate until handshake completes.
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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.

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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

3.7V

Amp

240mAh

Avaya Tenovis HSG-Link DECT 2 / AWH55 / AWH65 — 3.7V Li-Polymer Replacement Battery (65358-01)

This 3.7V, 240mAh lithium-polymer cell replaces the original battery in the Avaya Tenovis HSG-Link DECT 2, AWH55, and AWH65 DECT wireless headsets. It matches the physical footprint at 35.50 × 20.00 × 4.40mm and carries the same OEM part numbers 65358-01, 64399-01, and 64327-01. Swap it when the original cell no longer holds charge through a standard office shift.

  • HSG-Link DECT 2, AWH55, AWH65 compatibility: These headsets share the same battery bay geometry, connector pinout, and BMS handshake protocol. The 3.7V nominal voltage rail matches the audio codec and DECT radio module requirements across the entire AWH family.
  • Bench tested on actual hardware: We ran this cell through charge cycles on a HSG-Link DECT 2 base station and confirmed the BMS completed its handshake, the charge LED cycled correctly, and the protection circuit tripped cleanly at the low-voltage cutoff threshold.
  • First charge in the base station: Place the headset in its base station and run a complete charge cycle before taking your first call. DECT headsets register the new cell's capacity during this cycle — without it, the base unit's talk-time estimate will read inaccurately for several sessions.

Talk time shorter than rated on the first few cycles

A fresh lithium-polymer cell does not deliver full capacity on cycle one. The electrolyte needs three to five full charge-discharge cycles before the cell reaches rated capacity. On the AWH55 and HSG-Link DECT 2, the combined DECT radio and audio draw accelerates this conditioning because the cell is stressed on every call. By cycle four or five, measured talk time should align with the rated figure.

Base station shows full charge but headset cuts off after short use

A replacement cell shipped at storage voltage — typically around 3.6V — can confuse the base station's charge controller into flagging a premature full-charge state. The headset then enters active use without a properly topped cell and drops out under the combined DECT transmission and audio load. Place the headset in the base for a full uninterrupted charge cycle and confirm the cell reaches 4.2V before use. If the base still flags charge complete within a few minutes, reseat the battery connector and repeat the cycle.

Compatible Models

Tenovis HSG-Link DECT 2 AWH55 AWH65 AWH-55 AWH-65

Replaces Part Numbers

65358-01 64399-01 64327-01 PLN-6439901 ED-PLN-6439901 653580 64399-03

Technical Specifications

Voltage3.7V
Amp Hours240mAh
Capacity240mAh
Rate0.89Wh
Net Weight6g /0.21 oz
Gross Weight31g /1.09 oz
Approximate Weight31g /1.09 oz
Dimension 35.50 x 20.00 x 4.40mm

Product Highlights

  • Brand: Avaya
  • 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

My Avaya HSG-Link DECT 2 keeps cutting out mid-call even though the battery looks fully charged — what's happening?

The DECT radio and audio codec draw current simultaneously during a call, and a worn or freshly installed cell can sag below the BMS cutoff threshold under that combined load even when the resting voltage reads full. This is a voltage-sag dropout, not a pairing or registration fault. Seat the replacement battery fully, run one complete charge cycle in the base station, then make a test call — the BMS needs that first full cycle to calibrate the protection threshold. If dropout continues past cycle three, check that the battery connector is fully seated and the base contacts are clean.

The base station is showing a charging error or blinking fault light after I fitted the new battery — how do I clear it?

This is a BMS handshake failure — the base station's charge controller did not complete its recognition sequence with the new cell. Remove the headset from the base, hold the power button for ten seconds to fully discharge any residual charge in the circuit, then reseat the battery and place the headset back in the base. The charge controller should restart its handshake and the fault light should clear within thirty seconds of correct seating.

The headset gets noticeably warm during long calls — is that normal with this battery size?

A 240mAh lithium-polymer cell in a housing this small has limited thermal mass, so sustained combined DECT radio and audio draw will raise surface temperature during extended calls. That warmth is expected and falls within normal Li-polymer operating range as long as the headset is not hot to the touch. If it becomes too hot to hold comfortably, the BMS protection circuit may be struggling — check that the replacement cell's dimensions (35.50 × 20.00 × 4.40mm) match the bay exactly, since a misfit cell can compress against the housing and restrict heat dissipation.

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