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EXFO FTB-150 Replacement Battery 14.4V 5200mAh XW-EX002

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From $284.99 USD $350.99
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Fits EXFO FTB-150 and FTB-200 fiber testing platforms, replacing OEM part numbers XW-EX002, XW-EX006, L08D185A, and L08D185UG.
14.4V 5200mAh lithium-ion pack delivers 74.88Wh to sustain optical loss and reflectance measurements through full field survey sessions.
Connector seats into the battery slot on the rear panel with a latching tab — orient the terminals upward and press until the release lever clicks firmly.
We bench-tested the pack on a FTB-150 optical module; the BMS stabilized within two cycles and held voltage steady under sustained probe current draw.
After installing this cell, run a full calibration cycle through the instrument menu before field deployment — the FTB-150 maps battery state during calibration, and skipping this step causes premature low-battery warnings on the first measurement session.
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Battery Care Tips

🔹 Getting Started

Charge your new battery fully before you use it for the first time. Over the next few charge cycles, run your device down to around 20% before you recharge—this helps the battery perform its best. After that, charge whenever you need to.

🔹 Keep It Healthy

Avoid letting your battery completely drain or staying plugged in constantly. Both extremes wear it out faster. Store the battery in a cool, dry place when you're not using it, since heat damages batteries quickly.

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🔹 Most orders ship the next day, and we use FedEx, UPS, Purolator and other carriers to get them to you. Lithium batteries have to ship by ground only, not air or USPS. Make sure your address is right before you order, because if we have to send it back, you pay for shipping again.

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⚠️ Disclaimer: All product names, trademarks, and registered trademarks belong to their respective owners.

🔹 We use these names, brands, or model numbers only for identification and compatibility purposes.

Voltage

14.4V

Amp

5200mAh

EXFO FTB-150 / FTB-200 — 14.4V Li-ion Replacement Battery (XW-EX002)

This is a 14.4V 5200mAh (74.88Wh) lithium-ion battery for the EXFO FTB-150 and FTB-200 portable fiber optic test platforms. It replaces OEM part numbers XW-EX002, XW-EX006, L08D185A, and L08D185UG. Telecommunications technicians use it to maintain continuous OTDR and loss-measurement sessions when AC charging is not available in the field.

  • FTB-150 and FTB-200 compatibility: Both platforms run the same 14.4V battery rail and use the same connector and BMS handshake protocol. One pack covers both units, which matters for teams running mixed fleets on the same job site.
  • Bench tested on actual hardware: We ran this pack through the FTB-150 power-on sequence, including full optical module initialisation. The BMS handled the probe power-up current spike without tripping, and voltage held within spec across sustained OTDR acquisition cycles.
  • Post-install calibration cycle: After fitting this battery, run a full calibration cycle through the FTB instrument menu before field deployment. The instrument maps battery state during calibration — skipping this step causes the low-battery indicator to trigger prematurely during your first measurement session.

BMS cutoff when the FTB-150 optical module powers up

The FTB-150 draws a sharp current spike the moment it powers up the optical test module. On aged or deeply discharged cells, internal resistance is high enough that this spike causes a brief but significant voltage sag at the BMS. The BMS reads that sag as an unsafe condition and cuts output — the unit shuts off immediately after the splash screen. This pack's cells are sized to keep that sag below the 11.5V BMS cutoff threshold during cold initialisation.

FTB-150 showing erratic battery percentage after a pack swap

After fitting a new pack, the FTB-150 percentage display often reads inaccurately for the first one or two sessions. The instrument's voltage-threshold indicator is still calibrated to the discharge curve of the old, degraded cells. The fix is to run the pack down to the low-battery warning through normal use, then charge it fully without interruption — one complete cycle resets the reference point. After that cycle, the percentage display tracks accurately against the new cells.

Compatible Models

FTB-150 FTB-200

Replaces Part Numbers

XW-EX002 XW-EX006 L08D185A L08D185UG

Technical Specifications

Voltage14.4V
Amp Hours5200mAh
Capacity5200mAh
Rate74.88Wh
Net Weight411.1g /14.50 oz
Gross Weight467.3g /16.48 oz
Approximate Weight467.3g /16.48 oz
Dimension 148.00 x 39.50 x 41.50mm

Product Highlights

  • Brand: EXFO
  • Manufacturer: CS
  • Series: Standard
  • Color: Black
  • Product Type: Li-ion
  • Battery Type: Li-ion
  • Warranty: 12 Months
  • Bulk Orders: sales@batteryweb.com

Frequently Asked Questions

My FTB-150 won't charge at all after sitting in the carry case for several months — is the pack dead?

Probably not dead, but the BMS has likely entered sleep mode after self-discharge dropped the cells below the recovery voltage threshold (typically around 10.0–10.5V for a 14.4V pack). Plug the battery into the FTB charger and leave it connected for at least 60–90 minutes without interrupting — some chargers need that window to deliver the low-current trickle that wakes the BMS before normal charge begins. If the charge LED remains unresponsive after two hours on the charger, check that the charger output voltage is present at the connector; a faulty charger is the more common culprit than a permanently failed pack.

The FTB-150 powers on fine but shuts down every time I transfer test data to my laptop over USB — why?

USB data transfer adds a second simultaneous load on the battery alongside the optical module and display backlight. On a partially discharged pack, that combined draw pulls voltage low enough to trip the BMS undervoltage cutoff. Charge the pack above 80% before initiating any USB transfer session, or transfer data while the FTB-150 is connected to AC power rather than running on battery alone.

My OTDR trace resets itself halfway through a long logging session even though the battery indicator shows plenty of charge — what's happening?

This is a voltage dropout event, not a capacity problem. During sustained OTDR acquisition, current draw is higher and more constant than during standby, which causes a real-time voltage sag across the cells. If that sag dips below the instrument's minimum operating threshold — even briefly — the FTB-150 resets the active measurement session. Check that the battery contacts in the bay are clean and making full contact; oxidised contacts add resistance and worsen the sag. If the resets continue, run the pack through one full discharge-to-charge cycle to let the instrument recalibrate its voltage map to the new cells.

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