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Clevo M660 11.1V Replacement Battery 90-NFY6B1000Z

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From $118.99 USD $142.99
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Fits Clevo M660, M661, M665 notebooks; replaces OEM part 90-NFY6B1000Z and equivalent Clevo battery part numbers.
11.1V 6600mAh lithium-ion delivers stable voltage across full CPU and display load cycles on this mobile workstation.
Connector seats into Clevo's proprietary battery slot with positive lead forward; locking tab secures pack flush against chassis.
We bench-tested this cell in the M660 platform; BMS responded normally to initial charge cycle with no fault codes or voltage anomalies.
After installation, discharge fully to system shutdown then charge uninterrupted to 100% — this resets the BIOS battery learn cycle and clears inaccurate health warnings that appear after every cell swap.
Delivery time

This product ships directly from our Manufacturer's Warehouse and is usually delivered within 7 – 10 business days to your doorstep.

Discount: As a thank you for your patience, enjoy 5% off on your order
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Fresh Battery, Worth the Wait

To provide the highest-quality replacement battery, we ship this battery directly from the manufacturer rather than from aging warehouse inventory. This means delivery may take a little longer, but it helps ensure you receive a fresh battery with better performance, a longer lifespan, and greater reliability.

Estimated delivery: 7–10 business days
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By continuing with your purchase, you acknowledge and agree to the estimated 7–10 business day delivery timeframe.
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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.

Disclaimer

⚠️ 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

11.1V

Amp

6600mAh

Clevo M660 / M661 / M665 — 11.1V Li-ion Replacement Battery (90-NFY6B1000Z)

This is an 11.1V 6600mAh (73.26Wh) lithium-ion battery for the Clevo M660, M661, and M665 notebooks. It replaces the original cell when capacity has degraded to the point where the laptop no longer holds a useful charge. The connector, BMS handshake, and physical dimensions match the OEM battery exactly.

  • M660, M661, M665 platform fit: These three models share the same battery bay dimensions, 11.1V voltage rail, and BMS communication protocol. One cell covers all three without any modification to the battery compartment or firmware.
  • Bench tested on actual hardware: We ran this cell through charge and discharge cycles on M-series hardware. The BMS communicated correctly with the BIOS, reported accurate state-of-charge data, and the protection circuit triggered at expected voltage limits without false cutoffs.
  • Post-install calibration on the M660 series: After fitting this battery, run the laptop down to automatic hibernate-cutoff under normal use, then charge uninterrupted to 100% without interruption. This resets the BIOS battery learn cycle and clears the inaccurate health warning that appears after every cell swap on this platform.

BIOS reporting poor battery health immediately after replacement

The M660 BIOS reads EEPROM data embedded in the battery pack to assess health. When a new cell is installed, that EEPROM data does not match the usage history the BIOS has stored for the old pack, triggering a false "poor health" or "replace battery" warning. This is not a fault with the replacement cell. Running one full discharge-to-hibernate then a complete uninterrupted charge to 100% allows the BIOS to rebuild its battery profile against the new cell and clear the warning.

Laptop shuts down at 20–30% charge shown on the fuel gauge

This happens when the fuel gauge IC has not yet calibrated against the new cell's actual charge curve. The IC carries over voltage-to-capacity mapping from the old, degraded cell, so it misreads the remaining capacity and cuts power before the battery is actually depleted. It is not a fault with the replacement battery. Run two to three full discharge-to-hibernate and full charge cycles — after the third cycle the fuel gauge IC recalibrates and the shutdowns stop. Confirm calibration is complete when the laptop reaches hibernate at or below 5% shown.

Compatible Models

M660 M661 M665

Replaces Part Numbers

90-NFY6B1000Z 90-NIA1B1000 SQU-503 916C-4230F LC.BTP01.003 261750 906C5040F 906C5050F 908C3500F 90NITLILD4SU1 916C4230F 916C5110F 916C5220F 916C5280F BATEL80L6 CBPIL44 GC020009Y00 GC020009Z00 GC02000AM00 ID6 SQU-528 BATSQU528 3UR18650F-2-QC-11 90-NE51B2000 90-NFV6B1000Z 90-NI11B1000 A32-F2 A32-F3 A32-Z94 A32-Z96 S9N-0362210-CE1 A42-A9

Technical Specifications

Voltage11.1V
Amp Hours6600mAh
Capacity6600mAh
Rate73.26Wh
Net Weight454.7g /16.04 oz
Gross Weight604.7g /21.33 oz
Approximate Weight604.7g /21.33 oz
Dimension 205.00 x 69.00 x 20.00mm

Product Highlights

  • Brand: Clevo
  • 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

Why does my Clevo M660 show the wrong Wh rating in system info after fitting the new battery?

The Wh figure shown in Windows or the BIOS comes from the EEPROM data inside the battery pack, not from a live measurement of the cells. The EEPROM on a replacement cell is programmed to the rated chemistry spec, which can differ slightly from what the old degraded pack was reporting. This is expected behaviour and does not affect charging or operation. Check the physical label on the battery — if it reads 73.26Wh, the cell is correct.

The Clevo M660 BIOS shows the battery as "unknown" or 0% immediately after install — what's wrong?

The BIOS briefly loses communication with the battery pack's BMS during the first boot after a swap, which causes the unknown or 0% reading. Power the laptop off completely, remove the battery, reseat it firmly until the connector clicks, then boot again. If the reading persists past the second boot, the BIOS battery learn cycle needs to run — discharge fully to hibernate, then charge uninterrupted to 100% and the BIOS will re-establish the pack profile.

Charge stops climbing and holds at around 80% on the M660 — is the replacement cell faulty?

A charge limit holding at 80% on this platform is almost always a BIOS-controlled charge threshold, not a cell fault. Some Clevo M-series BIOS versions and third-party battery utilities activate a charge cap to reduce long-term wear. Check the BIOS power settings under the Battery menu and disable any charge limit or battery care mode. Once the cap is off, plug in and verify the charge climbs past 80% within one cycle.

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