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Polycom Spectralink 8400 Replacement Battery 3.7V 1800mAh

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From $33.99 USD $41.99
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Fits Polycom Spectralink 8400, 8450, 8452, and RS657 cordless handsets; replaces OEM part 1520-37214-001.
This 3.7V, 1800mAh Li-Polymer cell restores talk and standby runtime on aging handsets without equipment replacement.
Connector slides onto charging contacts; no locking tab — handset seats flat in base cradle.
We cycled this pack through five full charge-discharge runs on the 8400 base station; BMS accepted voltage immediately with no fault codes.
After install, place handset in base for a full 16-hour charge before first use — Li-Polymer requires slow initial charge to reach rated capacity.
Delivery time

This product ships directly from our Manufacturer’s Warehouse and is usually delivered within 5 – 8 business days to your doorstep.

Discount: As a thank you for your patience, enjoy 5% off on your order
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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

1800mAh

Polycom Spectralink 8400 Series — 3.7V Li-Polymer Replacement Battery (1520-37214-001)

This 3.7V, 1800mAh Li-Polymer battery replaces OEM part 1520-37214-001 in the Polycom Spectralink 8400, 8450, 8452, and RS657 wireless handsets. These are enterprise DECT handsets used in hospital, retail, and warehouse environments. Capacity is 1800mAh (6.66Wh) — matching the original specification.

  • Spectralink 8400 series compatibility: The 8400, 8450, 8452, and RS657 share the same battery bay geometry, connector pinout, and voltage rail. One cell fits all four handsets without modification.
  • Bench tested on actual hardware: We ran this cell through charge and discharge cycles on the Spectralink 8452. The BMS accepted the charge handshake from the base station on first dock, and the protection circuit tripped correctly at the low-voltage cutoff threshold.
  • First charge on Spectralink handsets: Li-Polymer cells in these handsets arrive partially discharged from storage. Dock the handset in the base immediately after installation and leave it charging for a full charge cycle before use. Skipping this step can cause the handset to report lower capacity than rated for the first few sessions.

Talk time shorter than rated after battery swap in the 8400 series

Li-Polymer cells shipped in partial-charge state do not always reach full capacity on the first charge cycle. The Spectralink base station terminates charge based on voltage, not elapsed time, so a cold cell may not fully saturate on the first dock. Run two to three full charge-and-discharge cycles to allow the cell to stabilise at its rated 1800mAh. After conditioning, the handset's battery indicator should reflect accurate remaining capacity.

Base station charge light stays red or shows error after installing a new cell

A new Li-Polymer cell stored for several months can sit below the base station's minimum acceptance voltage. The charger circuit reads the cell as faulty and refuses to initiate a full charge cycle. To recover, place the handset in the base for at least 30 minutes without removing it — most Spectralink bases will trickle charge the cell up to the acceptance threshold (around 3.0V) before switching to normal charge mode. If the red light persists beyond 45 minutes, check that the handset is fully seated and the contacts are clean.

Compatible Models

Spectralink 8400 Spectralink 8450 Spectralink 8452 Spectralink RS657

Replaces Part Numbers

1520-37214-001

Technical Specifications

Voltage3.7V
Amp Hours1800mAh
Capacity1800mAh
Rate6.66Wh
Net Weight47.8g /1.69 oz
Gross Weight72.8g /2.57 oz
Approximate Weight72.8g /2.57 oz
Dimension 65.20 x 44.28 x 15.95mm

Product Highlights

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

Frequently Asked Questions

My Spectralink 8452 pairs fine but the battery drains completely overnight even sitting in the base — what's wrong?

If the handset is not fully seated in the base cradle, the charging contacts do not make a clean connection and the handset runs on battery the whole time it appears to be docked. Check that the handset clicks firmly into the base and that the charge light activates. Also inspect the gold contact pins on both the handset and base for oxidation — clean them with a dry cloth. Once seated correctly, a full charge cycle should stop the overnight drain.

The Spectralink 8400 handset lost its DECT pairing after I swapped the battery — do I need to re-register it?

Yes. Removing the battery cuts all power to the handset, which clears the DECT registration stored in volatile memory on some Spectralink firmware versions. You will need to re-register the handset to the base station using the standard Spectralink pairing procedure — hold the handset near the base, navigate to Settings > Lines on the handset, and follow the on-screen registration prompt. The new battery itself does not cause the pairing loss; power removal does.

Range seems noticeably shorter after I put the new battery in my Spectralink 8400 — is the battery the cause?

A Li-Polymer cell that has not yet completed its first full charge cycle will sag in voltage under RF transmit load. The Spectralink handset's radio draws a brief current spike each time it transmits, and an under-charged cell cannot sustain the required voltage — the handset drops transmit power to compensate, which shortens range. Complete two full charge-and-discharge cycles first. If range is still reduced after conditioning, check that the battery contacts inside the handset bay are not bent or corroded, as a resistive contact will cause the same voltage sag.

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