EXFO AXS-200 OTDR Replacement Battery XW-EX001 10.8V 3400mAh

EXFO AXS-200 OTDR — 10.8V Li-ion Replacement Battery (XW-EX001)

This is a 10.8V 3400mAh Li-ion battery for the EXFO AXS-200 Optical Time Domain Reflectometer. It replaces OEM part XW-EX001 and fits the AXS-200 directly. The AXS-200 is a portable OTDR used for fiber optic fault location and loss measurement in the field.

• AXS-200 platform fit: The AXS-200 uses a 10.8V three-cell Li-ion pack with a specific BMS handshake for fuel gauge reporting. This pack matches that voltage rail and connector pinout, so the instrument reads charge state correctly rather than defaulting to error flags.
• Bench tested on actual hardware: We ran this pack through a full OTDR boot cycle and live fiber trace sequence. The BMS held stable through the laser module power-up surge and sustained the draw through a continuous acquisition session without cutoff.
• First-use calibration on the AXS-200: After fitting this pack, run a full calibration cycle through the AXS-200 instrument menu before heading into the field. The instrument maps battery state during that sequence — skipping it causes premature low-battery warnings on your first measurement session, even with a fully charged pack.

BMS cutoff when the AXS-200 laser module initialises

At startup, the AXS-200 powers its laser and acquisition hardware in a tight sequence that draws a short current spike. An aged or deeply discharged pack can drop below the BMS cutoff threshold at that exact moment, killing the unit before it reaches the home screen. This pack's cells are rated to handle that inrush without tripping the protection circuit. If the instrument still shuts off at boot, check that the battery contacts are clean and seated — a resistive connection amplifies the voltage sag at the connector.

AXS-200 showing erratic charge percentage after a battery swap

The AXS-200 uses a voltage-threshold indicator that recalibrates to the new cell's discharge curve over the first few cycles. Immediately after a swap, the percentage display may jump or read incorrectly — this is not a faulty pack. Run the battery down to the low-battery warning through normal use, then charge it fully without interruption. After one complete cycle the instrument's state-of-charge display stabilises, typically settling within a few percent of actual capacity.