About this replacement
Yealink CP925 / CP960 / CP965 Series — 3.7V Li-ion Replacement Battery (YLLR1865C7800WLS)
This is a 3.7V Li-ion replacement battery rated at 10050mAh (37.19Wh), carrying OEM part number YLLR1865C7800WLS. It fits the Yealink CP925, CP935W, CP960, and CP965 conference phones. These are standalone wireless conferencing units used in medium to large meeting rooms, and the battery powers both the audio processing and Bluetooth radio simultaneously.
- CP925 / CP935W / CP960 / CP965 compatibility: All four models share the same battery bay dimensions, connector pinout, and BMS communication protocol. The CP935W adds a wireless DECT radio, but the draw profile stays within the same voltage window — the pack handles both configurations without issue.
- Bench tested on actual hardware: We cycled this pack through the CP960 dock and monitored BMS handshake, charge termination, and protection circuit cutoff. The cell accepted a full charge at the expected rate and the BMS reported state-of-charge correctly after one complete cycle.
- First-session calibration tip: After installing this pack, run a full charge cycle before using the unit in a live meeting. Yealink's battery indicator maps state-of-charge against voltage thresholds learned during normal operation — a freshly swapped pack may show inaccurate warnings until one full charge and discharge cycle completes.
Why the CP925 drops its wireless connection under sustained conference load
The CP925 runs audio processing and Bluetooth simultaneously, which creates a combined draw that spikes when multiple speakers are active. If the battery pack has degraded internal resistance, voltage sag under that combined load can fall below the BMS protection threshold. The unit responds by dropping the wireless radio first — audio processing takes priority. A fresh pack with low internal resistance holds the voltage rail steady and prevents those mid-meeting dropouts.
Battery indicator showing full charge, then jumping to low without warning
This symptom usually means the unit's state-of-charge map is still calibrated to the old battery's discharge curve. The CP960 and CP965 track battery level by measuring voltage against a stored profile — a new cell with different characteristics throws that profile off. The fix is straightforward: charge the pack to 100%, use the unit until the low-battery alert triggers, then charge fully again. After that single cycle, the indicator stabilises and tracks accurately.