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Yealink CP925 Replacement Battery 3.7V 7800mAh Li-ion

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From $43.99 USD $54.99
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Fits Yealink CP925, CP935W, CP960, CP965 conference speakers; replaces OEM part YLLR1865C7800WLS.
3.7V 7800mAh Li-ion cell delivers 28.86Wh — sustains wireless audio and microphone transmission during extended conference sessions without external power.
Cylindrical 18650 cell; slides into side-mounted battery compartment with positive terminal first; locking tab engages on removal.
We bench-tested on CP925 protocol; BMS engaged load draw at 2.8A sustained and showed stable voltage output across full discharge curve.
After installation, run one complete charge cycle before the first meeting — the CP925 maps battery state during normal operation and may display inaccurate capacity warnings for the initial session after swap.
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

7800mAh

Yealink CP925 / CP935W / CP960 / CP965 — 3.7V Li-ion Replacement Battery (YLLR1865C7800WLS)

This is a 3.7V, 7800mAh Li-ion battery for the Yealink CP925, CP935W, CP960, and CP965 portable conference phones. It replaces part number YLLR1865C7800WLS when the original cell degrades and the unit can no longer hold a charge through a full meeting. Fitting this battery restores wireless operation so the unit is no longer tethered to a power outlet.

  • CP925 / CP935W / CP960 / CP965 platform fit: These four units share the same battery cavity dimensions, connector pinout, and BMS communication protocol — the same pack services all four without modification.
  • Bench tested on actual hardware: We cycled this pack under sustained audio and wireless draw simultaneously. The BMS held voltage within the expected window and did not trigger a premature cutoff under combined load.
  • First-session calibration: After installing, run a full charge cycle before the first meeting. Conferencing units map battery state during normal operation, and the indicator may show inaccurate warnings for the first session after a swap until the system has completed one full cycle.

Battery indicator showing wrong level after installation

Yealink conference units use voltage-threshold mapping to estimate charge level — they do not recalibrate automatically when a new pack is fitted. After a battery swap, the unit reads the new pack's resting voltage and assigns a charge percentage based on its stored curve, which may not match the actual state of charge. This produces misleading warnings or incorrect percentage readings on screen. One complete charge cycle from flat to full forces the system to re-anchor its reference points and restores accurate indicator behaviour.

Wireless connection drops mid-meeting after battery swap

The CP925 and CP935W run both the audio codec and the wireless radio from the same battery rail. Under peak combined draw — loud room audio plus active wireless transmission — voltage can sag briefly below the radio module's operating floor, causing it to drop the connection. This is more likely with a battery that has been sitting in storage and has not been conditioned. A full charge cycle before first use stabilises the pack's internal resistance and reduces sag under peak load. If drops continue after conditioning, check that the pack contacts are fully seated and free of debris.

Compatible Models

CP925 CP935W CP960 CP965

Replaces Part Numbers

YLLR1865C7800WLS

Technical Specifications

Voltage3.7V
Amp Hours7800mAh
Capacity7800mAh
Rate28.86Wh
Net Weight142g /5.01 oz
Gross Weight167g /5.89 oz
Approximate Weight167g /5.89 oz
Dimension 70.00 x 57.00 x 20.00mm

Product Highlights

  • Brand: Yealink
  • Manufacturer: CS
  • Series: Standard
  • Color: Blue
  • Product Type: Li-ion
  • Battery Type: Li-ion
  • Warranty: 12 Months
  • Bulk Orders: sales@batteryweb.com

Frequently Asked Questions

My CP925 won't turn on at all after fitting the new battery — no lights, no response from the power button.

This points to the BMS entering deep-discharge lockout during storage. Connect the unit to its charger and leave it for at least 30 minutes before pressing the power button — the BMS needs a trickle input to exit lockout before it will allow the unit to boot. If the charge LED does not illuminate within five minutes of connecting, wipe the pack contacts and the dock contacts with a dry cloth, reseat the battery firmly, and reconnect the charger.

The charging dock shows a fault light or refuses to charge the unit after the battery was replaced.

Dock fault lights after a battery swap are usually contact resistance issues, not a pack fault. Remove the unit from the dock, wipe both the battery contacts and the dock contacts with a dry lint-free cloth, then reseat the unit with firm, even pressure. If the fault persists, try charging via the USB-C port directly rather than the dock — if the pack accepts charge that way, the issue is dock contact alignment rather than the battery.

The unit feels noticeably warm on the underside during long conference calls — is that a battery problem?

Sustained draw from simultaneous audio processing and wireless transmission generates heat, and the CP925's compact enclosed housing has limited airflow around the battery. Some warmth during extended sessions is normal. If the unit becomes hot enough to be uncomfortable to touch, or if it shuts down mid-call, check that ventilation slots on the underside are clear. A healthy pack under normal load should not push surface temperature above approximately 40°C — anything beyond that warrants removing the unit from operation and inspecting the battery seating.

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