EXFO FTB-2 Replacement Battery XW-EX011 14.4V 6400mAh

EXFO FTB-2 / FTB-2-PRO Series — 14.4V Li-ion Replacement Battery (XW-EX011)

This 14.4V 6400mAh Li-ion battery replaces the OEM pack in the EXFO FTB-2, FTB-2-PRO, FTB-500, FTB-1v2-PRO-HPDC, and related FTB platform units. The FTB series are modular fiber optic test platforms used for optical power measurement, OTDR testing, and loss analysis in the field. This pack restores portable operation when the original cell no longer holds charge through a full measurement session.

• FTB platform compatibility: The FTB-2, FTB-2-PRO, FTB-500, and FTB-1v2-PRO-HPDC share the same 14.4V battery bay, connector pinout, and BMS communication protocol. Swapping between these models does not require any hardware modification — the pack seats and handshakes identically across the platform.
• Bench tested on actual hardware: We ran this pack through full charge-discharge cycles on FTB-series hardware. The BMS negotiated correctly with the instrument's power management circuit, held voltage through simulated OTDR module load, and did not trip on module initialisation current draw.
• Post-install calibration cycle: After fitting this pack, run a full calibration cycle through the FTB instrument menu before heading to a job site. The FTB maps battery state during that calibration pass — skipping it causes the instrument to report premature low-battery warnings during the first measurement session in the field.

FTB-2 voltage dropout under sustained OTDR module load

OTDR and optical modules draw sustained current during an acquisition sweep — more than the FTB-2's standby draw by a significant margin. An aged or depleted cell cannot hold the 14.4V rail steady under that load, and the instrument's internal regulator interprets the sag as a low-battery condition. The result is an abrupt shutdown mid-sweep, even when the indicator showed adequate charge moments before. This pack's cells are spec'd to hold the voltage rail through the module's full acquisition window without triggering that cutoff threshold.

FTB battery percentage jumping or resetting at each reboot

When a new pack is installed, the FTB's battery indicator is still calibrated against the old cell's discharge curve. This causes the percentage readout to jump, reset, or show wildly inconsistent values across the first several power cycles. The fix is to run the instrument's battery calibration routine found in the system settings menu — not just a single charge cycle. After one full calibration pass, the indicator stabilises and tracks accurately against the new cell's actual charge state.