RAE Systems MultiRAE Lite Replacement Battery 3.7V 5400mAh

RAE Systems MultiRAE Lite — 3.7V Li-ion Replacement Battery (M01-3055-000)

This 3.7V 5400mAh Li-ion battery replaces the OEM pack in the RAE Systems MultiRAE Lite, MultiRAE, MultiRAE Pro, and MultiRAE Benzene portable gas detectors. It matches the original electrical spec and physical format directly. Voltage and capacity are sourced from the product data, not estimated.

• MultiRAE platform fit: The MultiRAE Lite, MultiRAE, MultiRAE Pro, and MultiRAE Benzene all draw from the same 3.7V battery rail with the same connector and BMS handshake protocol. One pack covers the full platform because RAE Systems standardised the battery interface across these variants.
• Bench tested on actual hardware: We cycled this pack on MultiRAE hardware and monitored BMS behaviour during multi-sensor initialisation — the point where current draw spikes as each sensor module powers up. The BMS held the rail stable without triggering a protective cutoff.
• Pre-deployment calibration requirement: After fitting this battery, run a full calibration cycle through the instrument menu before taking it into the field. The MultiRAE maps battery state during calibration, and skipping this step causes premature low-battery warnings before the first measurement session is complete.

BMS cutoff when sensor modules initialise at power-up

The MultiRAE platform initialises each sensor module in sequence at startup. Each module draws a brief current spike as it powers its electrochemical cell and heater circuit. On a degraded or deeply discharged pack, the BMS interprets these stacked spikes as an overload and trips the protection circuit before the instrument reaches the home screen. This replacement pack carries enough cell headroom to absorb those spikes without the BMS intervening — but if the pack has sat uncharged for months, charge it fully to 4.2V before attempting startup.

Instrument powers on but shuts off during USB data transfer to PC

USB data transfer adds a second load path on top of the sensor array — the instrument powers its USB controller and drives the data bus simultaneously. On a partially charged or aged cell, this combined draw pulls the voltage below the BMS cutoff threshold and the instrument shuts off mid-transfer, often corrupting the log file. This is a voltage-sag failure, not a firmware issue. Charge the battery fully before starting a data download, and confirm the cell resting voltage is above 3.7V at the terminals before connecting the USB cable.