Yamaha RRC1120 Wireless Microphone Replacement Battery 3.7V 1800mAh

Yamaha RM-WGL / RM-WGS — 3.7V Li-Polymer Replacement Battery (RRC1120)

This 3.7V 1800mAh (6.66Wh) lithium-polymer battery replaces the original pack in Yamaha RM-WGL and RM-WGS wireless directional tabletop microphone units. It fits the handheld transmitter used in conference rooms, presentations, and live meeting environments. Voltage and cell format match the OEM specification exactly.

• RM-WGL and RM-WGS platform fit: Both microphone models share the same 3.7V battery rail, connector pinout, and BMS handshake protocol — one replacement pack covers the full tabletop wireless range without modification.
• Bench tested on actual hardware: We cycled this pack through the RM-WGL transmitter unit and confirmed the BMS accepted the cell, completed charge termination correctly, and passed the unit's internal battery authentication check without error flags.
• First-session calibration tip: Run a complete charge cycle before the first meeting. Yamaha's wireless transmitter maps battery state against voltage thresholds during active operation — a freshly installed pack may show inaccurate level warnings until the unit completes one full charge-to-discharge cycle.

Why the RM-WGL drops connection mid-meeting under combined audio and RF draw

The RM-WGL transmitter runs audio processing and RF transmission simultaneously during active conference sessions. This combined draw creates short current spikes that a degraded or deeply discharged cell cannot sustain without voltage sag. When cell voltage dips below the BMS cutoff threshold — typically around 3.0V under load — the unit interrupts the RF link before fully powering down. A fresh 1800mAh pack with a healthy internal resistance restores the voltage headroom needed to handle those spikes cleanly.

Charging dock not registering the new battery after a swap

If the dock shows no charging activity after installing a replacement pack, the most common cause is contact resistance at the dock pins rather than a fault with the cell itself. Oxidation or debris on the battery's contact pads prevents the dock from reading a valid connection. Wipe the gold contacts on both the battery and the dock cradle with a dry cloth, then reseat the unit firmly. If the dock still shows no activity, check that resting cell voltage is above 3.2V — a pack shipped in deep storage may need a low-current pre-charge before the dock circuit recognises it.