Yealink CP930W Replacement Battery 3.7V 7800mAh

Yealink CP930W — 3.7V Li-ion Replacement Battery (YLLR1865C7800WLS-2)

This is a 3.7V 7800mAh Li-ion battery for the Yealink CP930W wireless conference phone. It replaces OEM part YLLR1865C7800WLS-2 and fits directly into the CP930W housing. When the original cell degrades, call quality and wireless stability drop before the unit shuts down entirely — this swap restores full cordless operation.

• CP930W platform fit: The CP930W runs a single-cell 3.7V Li-ion architecture with a BMS that monitors both audio and DECT wireless draw simultaneously. This replacement matches that voltage rail and connector pinout, so the BMS handshake initialises without error codes on boot.
• Bench tested on actual hardware: We cycled this cell under combined audio-plus-DECT load and confirmed the BMS holds the protection threshold steady through sustained conference draws without triggering a false low-voltage cutoff.
• First-session calibration tip: After installing, run a complete charge cycle before your first meeting. The CP930W maps battery state through normal operation — the indicator may read inaccurately for the first session post-swap until the system completes one full charge-discharge reference pass.

Battery indicator showing wrong level after installation

The CP930W uses a voltage-threshold model to estimate charge level. A new cell starts at a resting voltage the firmware hasn't mapped yet, so the display can show anything from empty to full on first boot. This isn't a fault with the battery — it's the system working from a stale reference. One complete charge cycle from flat to full resets the threshold table and the indicator reads accurately from that point forward.

CP930W not turning on after battery swap

Replacement cells shipped from storage often sit below the BMS wake-up threshold — typically under 3.0V — which causes the CP930W to show no response at all when you press power. The BMS locks out to prevent over-discharge damage during transit, not because the cell is faulty. Place the unit on its charging dock and leave it for 20–30 minutes without pressing anything; the dock trickle-charges through the protection circuit until the cell reaches approximately 3.2V, at which point the BMS releases and the unit boots normally.