Cisco CP-8832 Wireless Expansion Microphone Compatible Battery 3.7V 580mAh

Cisco CP-8832 Wireless Expansion Microphone — 3.7V Li-Polymer Replacement Battery (CP-8832-MIC-WLS)

This 3.7V, 580mAh Li-Polymer battery replaces the original pack inside the Cisco CP-8832 Wireless Expansion Microphone. It fits the cordless satellite mic unit used with Cisco conference phone systems. Swap it when the original battery no longer holds a charge or fails to power the unit.

• CP-8832 Wireless Expansion Microphone fit: The CP-8832 wireless mic draws from a single-cell 3.7V Li-Polymer pack to run both the audio pickup circuit and the 2.4GHz wireless link simultaneously. This replacement matches that cell configuration, voltage rail, and connector orientation so the dock-side charging circuit and BMS handshake function without reconfiguration.
• Bench tested on actual hardware: We cycled this pack through full charge and discharge on the CP-8832 platform, confirming the BMS accepted the cell, the dock registered a valid charge state, and protection circuits tripped correctly at low-voltage threshold.
• First-session calibration after swap: After installing, run one complete charge cycle before your first meeting. The CP-8832 maps battery state against voltage thresholds during normal operation — a fresh pack that hasn't been cycled yet will cause the indicator to read inaccurately for the first session.

Voltage sag under combined audio and wireless draw in the CP-8832

The CP-8832 wireless mic runs audio pickup and a 2.4GHz radio link off the same 580mAh cell. When both circuits draw simultaneously during an active call, instantaneous current demand spikes. A degraded original battery drops voltage sharply under that combined load, which the BMS interprets as a low-cell event and cuts output. A new cell with full capacity handles the combined draw without triggering that cutoff.

Charging dock not registering the new battery after installation

If the dock shows no charging activity after you seat the mic, the most common cause is contact resistance between the pack terminals and the dock's charging pins. Li-Polymer packs shipped in storage mode can also have a surface oxide layer on the contacts. Wipe the pack contacts with a dry cloth, reseat the mic firmly in the dock, and confirm the dock LED changes state. If the pack voltage reads below 3.0V on a multimeter, it may be in deep-discharge lockout — leave it on dock for 15–20 minutes to allow the recovery charge circuit to bring it above the BMS re-initialisation threshold of approximately 3.0V.