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EXFO FOT-5200 Replacement Battery 3.7V 1800mAh 880X264

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Fits EXFO FOT-5200 and FOT-5200 CWDM Channel Power Analyzer; replaces OEM part 880X264.
3.7V 1800mAh Li-Polymer delivers stable power across full measurement cycles without voltage sag.
Connector slides into battery slot with positive terminal facing instrument body; locking tab seats flush.
We bench-tested this pack on idle measurement sequences and active probe initialization; BMS held steady under sustained sensor load with no cutoff events.
After installing, run a full calibration cycle through the instrument menu before field deployment — the FOT-5200 maps battery state during calibration, and skipping this step causes premature low-battery warnings on the first measurement session.
Delivery time

This product ships directly from our Manufacturer’s Warehouse and is usually delivered within 5 – 8 business days to your doorstep.

Discount: As a thank you for your patience, enjoy 5% off on your order
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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.

Delivery and Shipping

🔹 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

3.7V

Amp

1800mAh

EXFO FOT-5200 Series — 3.7V Li-Polymer Replacement Battery (880X264)

This 3.7V 1800mAh Li-Polymer battery replaces the OEM pack in the EXFO FOT-5200 and FOT-5200 CWDM Channel Power Analyzer. Both instruments are handheld optical time-domain reflectometers used for fiber optic network testing and diagnostics in the field. Capacity is 1800mAh (6.66Wh), matching OEM part numbers 880X264, GP-2150, and GP103045L180R.

  • FOT-5200 and FOT-5200 CWDM shared platform: Both units run on the same 3.7V power rail with an identical physical connector and BMS handshake protocol. One battery pack covers both variants without modification.
  • Bench tested on actual hardware: We cycled this pack through the FOT-5200 charge and discharge sequence and confirmed the BMS negotiated correctly at startup. The protection circuit held within spec across OTDR pulse launches, which draw brief current spikes as the laser fires.
  • Post-install calibration before field deployment: After fitting this pack, run a full calibration cycle through the FOT-5200 instrument menu before heading out. The instrument maps battery state during calibration — skip it and the low-battery warning triggers early on your first measurement session, cutting a job short.

BMS lockout after the FOT-5200 sat unused in a carry case for months

Li-Polymer cells self-discharge slowly during storage. If the pack drops below roughly 2.5V per cell, the BMS trips into deep-discharge lockout and the instrument shows no response — not even a charging indicator. The charger sees an apparent open circuit and stops attempting to charge. To recover, connect the FOT-5200 to its OEM charger and leave it undisturbed for at least 90 minutes before pressing power — some BMS circuits require a slow trickle before they re-initialise the charge path at the standard 4.2V ceiling.

FOT-5200 shutting down mid-measurement with no low-battery warning

This failure mode is not a capacity problem — it is a voltage sag problem. During an OTDR pulse launch, the laser module draws a sharp current spike that momentarily pulls cell voltage below the BMS under-voltage threshold, triggering a protective shutdown before the fuel gauge registers low. A cell that reads 40% on the display can still cause this if internal resistance has climbed with age. Fit the new pack, run the calibration cycle, and confirm pulse-launch shutdowns stop occurring before returning the instrument to service.

Compatible Models

FOT-5200 FOT-5200 CWDM Channel Power Analyzer

Replaces Part Numbers

880X264 GP-2150 GP103045L180R

Technical Specifications

Voltage3.7V
Amp Hours1800mAh
Capacity1800mAh
Rate6.66Wh
Net Weight41g /1.45 oz
Gross Weight66g /2.33 oz
Approximate Weight66g /2.33 oz
Dimension 65.20 x 32.40 x 9.80mm

Product Highlights

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

Frequently Asked Questions

The FOT-5200 powers on fine but shuts off the moment it starts an OTDR trace — the battery still showed charge. What's happening?

This is a voltage sag shutdown, not a capacity failure. The laser fires a pulse that pulls a sharp current spike, and if the cell's internal resistance is high enough, voltage drops below the BMS cutoff threshold instantly — before the display even registers low. The instrument interprets this as an under-voltage fault and cuts power to protect the cell. Fit the new pack and run one full OTDR trace immediately after the calibration cycle to confirm the shutdown stops.

My FOT-5200 won't charge or power on after the unit sat in storage — the screen is completely blank. How do I recover it?

The Li-Polymer cell has self-discharged below the BMS recovery threshold, typically around 2.5V per cell, and the protection circuit has locked out the charge path. Plug the FOT-5200 into its OEM charger and leave it connected without interruption for at least 90 minutes — the BMS needs a sustained low-current trickle before it re-enables the main charge path. Once the charging indicator appears on screen, the BMS has re-initialised and will charge normally to 4.2V.

Readings on the FOT-5200 are drifting or resetting partway through a logging session even though the battery icon shows mid-charge. What causes this?

Sustained sensor load during a logging session draws continuous current, and a degraded or mismatched cell can't hold voltage steady under that load. The voltage dropout is brief but enough to cause the instrument's processor to reset or corrupt the active measurement buffer. A fresh pack with low internal resistance eliminates the dropout — after fitting, run the instrument's calibration cycle through the menu so it re-maps voltage thresholds against the new cell before the next logging session.

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