Shure MXW Replacement Battery 3.7V 2600mAh Li-ion

Shure MXW / MXW2 Handheld Transmitter — 3.7V Li-ion Replacement Battery (95A35233 / SB905)

This is a 3.7V, 2600mAh (9.62Wh) Li-ion replacement battery for the Shure MXW and MXW2 Handheld Transmitters. It slots into the transmitter body and powers the RF transmit stage, DSP processing, and audio conditioning circuitry. If your original battery is failing to hold charge or causing dropouts mid-show, this is the direct replacement using OEM part numbers 95A35233 and SB905.

• MXW and MXW2 compatibility: Both transmitters run the same 3.7V cell architecture, share the SB905 battery form factor, and use the same BMS handshake protocol. One replacement covers both units without any modification.
• Bench tested on actual hardware: We cycled this battery through full charge and discharge passes on live MXW hardware. The BMS engaged correctly at low-voltage cutoff, and the transmitter registered a full charge state without any pairing errors or indicator faults on the receiver display.
• Transmitter storage between productions: If the MXW sits unused for more than two weeks, remove the battery before storage. Li-ion cells in transmitters can drift below 3.0V during extended idle — below that threshold, the BMS latches into deep-discharge protection and the unit will not power on until a dedicated recovery charge is applied.

Voltage sag under simultaneous RF transmit and DSP load in the MXW

The MXW draws current from two paths at once — the RF transmit stage and the onboard DSP that handles audio processing and encryption. At peak load, this combined draw can pull the cell voltage down momentarily, even on a freshly charged battery. A cell with any capacity fade will sag past the BMS cutoff threshold and drop the transmitter offline. A fresh 2600mAh cell maintains enough headroom to keep both load paths stable across the full charge cycle. If dropouts occur only during loud passages or rapid gain changes, voltage sag under DSP peak load is the likely cause.

Receiver loses sync immediately after transmitter battery swap

Removing the battery in the MXW cuts power to the transmitter's RF and memory circuits entirely. Some MXW system configurations treat this as a link loss event and drop the paired channel on the receiver. When you reinstall the battery and power the transmitter back on, the receiver may show no signal or an unlinked status. Initiate a fresh RF channel scan on the receiver, then trigger the transmitter link from the MXW body — this re-establishes the RF handshake. Confirm the receiver shows a steady link indicator before going live.