About this replacement
Shure MXW2 Handheld Transmitter — 3.7V Li-ion Replacement Battery (95A35233 / SB905)
This 3.7V, 3350mAh (12.4Wh) lithium-ion battery fits the Shure MXW Handheld Transmitter and MXW2 Handheld Transmitter. These are rechargeable wireless microphone transmitters used in live sound, broadcast, and AV presentation environments. This cell matches the original OEM part numbers 95A35233 and SB905.
- MXW and MXW2 platform fit: Both transmitters share the same battery bay geometry, contact configuration, and BMS handshake protocol. A single cell covers both models — no adapter or wiring change needed.
- Bench tested on actual hardware: We cycled this battery through full charge-discharge on the MXW2 transmitter body. The BMS accepted the cell without error flags, held the 3.7V nominal rail under active RF transmission load, and reported charge state accurately through the transmitter's onboard indicator.
- Contact surface maintenance on MXW transmitters: The MXW battery contacts are recessed and collect debris from handled transmitters. Oxidation on those contacts raises resistance and triggers false low-battery readings. Wipe the gold contact pads with a dry lint-free cloth each time you swap cells — do not use alcohol on the transmitter-side contacts, as it can strip the conductive coating.
Voltage sag on the MXW2 under combined RF transmit and DSP load
The MXW2 runs active DSP processing alongside the RF transmit stage, and both draw current simultaneously during live transmission. A degraded or partially charged cell can't sustain the combined load, and voltage dips below the BMS cutoff threshold even when the indicator shows a partial charge. This isn't a transmitter fault — it's the cell failing to hold voltage under peak draw. A fresh cell at full charge resolves the sag. If signal cuts persist after fitting a new cell, check that the battery is fully charged to 4.2V before use.
Receiver fails to sync after swapping the transmitter battery
The MXW system stores pairing data in volatile memory on the transmitter side. If the battery drops below the BMS cutoff during a swap — even briefly — the transmitter can lose its sync state with the receiver. The receiver shows the transmitter as unlinked even though the new cell is fully charged. Fix this by running the IR sync procedure again: hold the transmitter's sync button close to the receiver's IR window and follow the on-screen re-pair prompt on the MXW access point.