About this replacement
Cisco CCP-MIC-WRLS-S-US / Unified IP Conference Phone 8831 — 3.7V Li-Polymer Replacement Battery (74-111509-01)
This 3.7V 500mAh (1.85Wh) lithium-polymer cell replaces the rechargeable battery in the Cisco CCP-MIC-WRLS-S-US wireless microphone transmitter. It also fits the CP-MIC-WRLS unit and the Unified IP Conference Phone 8831 and 8831 Daisy Chain Kit configurations. OEM part numbers covered: 74-111509-01, E472248, and 4500044-00.
- 8831 wireless mic ecosystem fit: The CCP-MIC-WRLS-S-US and CP-MIC-WRLS transmitters share the same 3.7V Li-Polymer cell, connector pinout, and BMS communication protocol across the 8831 conference phone platform — one battery SKU covers the full wireless mic range in that system.
- Bench tested on actual hardware: We ran this cell in a CCP-MIC-WRLS-S-US transmitter unit. The BMS accepted the pack without error, completed a charge cycle through the base cradle, and reported battery status correctly to the 8831 host phone.
- First charge after installation: Place the wireless mic transmitter in its charging cradle and leave it undisturbed for a full charge cycle before use — Li-Polymer cells shipped in partial-charge storage state need one complete cycle to calibrate the host system's fuel gauge accurately.
Why the 8831 wireless mic shows a low-battery warning immediately after a new cell is installed
The 8831 conference phone reads battery state-of-charge from the transmitter's BMS, not from raw voltage alone. A new Li-Polymer cell shipped at storage voltage (typically 3.5–3.6V) sits below the BMS's "full" threshold, so the host phone logs it as low or unknown. One complete charge cycle through the cradle resets the BMS register and clears the warning. After that cycle, the status indicator reports correctly.
Wireless mic transmitter not recognised by the 8831 base after battery replacement
Removing the battery cuts all power to the transmitter, which can erase the DECT pairing record stored in volatile memory on some firmware versions. When the 8831 base no longer sees the mic, it's usually a lost pairing — not a faulty cell. Re-seat the transmitter in the cradle, allow it to charge to at least 3.7V, then re-run the pairing procedure from the 8831 phone's admin menu. The base should detect the transmitter within 60 seconds of initiating the scan.