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MSI EX600 11.1V 6600mAh Replacement Battery 90-NFY6B1000Z

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From $118.99 USD $142.99
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Fits MSI EX600, M655, M660, M662 notebooks; replaces OEM part 90-NFY6B1000Z and equivalent variants across MSI and compatible platforms.
Delivers 11.1V at 6600mAh (73.26Wh) — matches original output; sustains CPU and display load without mid-cycle voltage sag on gaming workloads.
Uses standard barrel connector with keyed orientation and mechanical locking tab; seats flush into the battery bay without modification or shimming.
We ran full discharge and recharge cycles on EX600 test unit; BMS engaged at 73.26Wh nominal and held voltage curve flat through mid-range discharge before expected taper near cutoff.
On first install, run one complete discharge cycle to system hibernation, then charge uninterrupted to 100% — this resets the BIOS fuel gauge calibration 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

MSI EX600 / M660 Series — 11.1V Li-ion Replacement Battery (90-NFY6B1000Z)

This is an 11.1V, 6600mAh (73.26Wh) Li-ion battery for the MSI EX600 notebook and compatible M-series laptops. It replaces the original cell when the factory pack no longer holds a charge or fails to complete a charge cycle. Fits a broad range of MSI notebook platforms sharing the same voltage rail and connector spec, including the M655, M660, and M662.

  • EX600 and M-series platform fit: These models share a common 11.1V three-cell architecture, identical connector pinout, and the same BMS communication protocol — which is why one battery spans all of them. Swapping across these platforms does not require firmware changes or hardware modification.
  • Bench tested on actual hardware: We cycled this cell through full charge and discharge on an MSI M660 platform. The BMS handshake completed correctly, charge acceptance registered immediately, and the protection circuit tripped at the expected low-voltage cutoff threshold without false shutdown events.
  • Post-install calibration on the EX600: After fitting this battery, run one full discharge to the BIOS hibernate cutoff, then charge uninterrupted to 100%. This resets the BIOS battery learn cycle and clears the inaccurate health warning that appears after every cell swap on MSI notebooks.

BIOS reporting poor battery health immediately after fitting a new cell

The BIOS reads health data from EEPROM stored on the battery's BMS board — not from the cells themselves. When a new cell arrives, that EEPROM may carry factory default values that don't match what the BIOS expects to see after a full charge. MSI notebooks flag this as "poor health" or "battery unknown" on first boot. One complete learn cycle — full discharge to hibernate cutoff, then uninterrupted charge to 100% — rewrites the BIOS battery data and clears the warning.

EX600 shutting down at 20–30% charge shown on screen

This is a voltage cliff failure — the cell can no longer sustain adequate voltage under the combined load of the CPU, GPU, and display, even though the fuel gauge still reads 20–30%. The fuel gauge IC is calibrated against the old cell's discharge curve, so it cannot accurately predict the new cell's cutoff point for the first few cycles. The laptop interprets the sudden voltage drop as a critical low-battery condition and cuts power before the gauge catches up. Run two to three full discharge-to-hibernate cycles and the fuel gauge IC will recalibrate against the new cell's actual curve, resolving the early shutdown.

Compatible Models

EX600 M655 M660 M662 M670 M677 M51A M51Kr M51Se M51 M51Sn M51Sr M51Ta M51Tr M51Va M51Vr MegaBook M1034 M660m M673 M675 VR600 MegaBook M655 MegaBook M660 MegaBook M662 MegaBook M670 MegaBook M673 MegaBook M675 MegaBook M677 MS1034 MS103 Micro Star PR600 Micro Star PR600-100 Micro Star PR600-1WOS CR400 CR400X CR420 CR420X CX410 CX420 CX420X CX420MX EX400 EX400X EX410 EX460 EX460X EX465 EX465X EX600X EX610 EX610X EX620 EX620X EX623 EX623X EX625 EX625X EX628 EX628X EX629 EX629X EX630 EX630X EX720 EX720X GE600 GE600X GX400 GX400X GX403 GX403X GX600 GX600X GX610 GX610X GX620 GX620X GX623 GX623X GX630 GX630X GX633 GX633X GX640 GX640X GX675 GX675X GX677 GX677X GX720 GX720X GX730 GX730X GX740 GX740X GT627 GT627X GT628 GT628X GT640 GT640X GT720 GT720X GT725 GT725X GT729 GT729X GT735 GT735X GT740 GT740X M1034 M677V MS1039 MS1613 MS1632 MS1633 MS1634 MS1636 MS1637 MS163D MS1651 MS1652 MS1721 MS1722 MS1432 MS1451 MS163K MS1644 PR600 PR600X PR620 PX600 PX600X VR430 VR430X VR440 VR440X VR600X VR601 VR601X VR602 VR602X VR603 VR603X VR610 VR610X VR620 VR620X VR630 VR630X VX600 VX600X

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 BTY-M68 S91-0300250-CE1 SQU-511 SQU-529 6-87-M66NS-4CA 1957-14XXXP-107 957-1722T-102 BTY-M66 BTY-M67 GSM-BMS194ABA00-G M660-NBAT-6S91-0300240-CE1 S91-030024X-CE1 SQU-524 957-14XXXP-103 916C4950F 957-14XXXP-107 BTY-M61 BTY-M65 CBPIL48 CBPIL72 CBPIL73 M660BAT-6 M660NBAT-6 SQU-424 SQU-523 SQU-601 SQU-605 SQU-706 SQU-718

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: MSI
  • 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 MSI EX600 shows the new battery at 0% and won't charge — is the EEPROM the problem?

Yes, in most cases. The BIOS pulls state-of-charge data from the battery's EEPROM, and a freshly installed cell often carries factory default values that read as empty or unrecognised. Plug in the AC adapter and leave it connected for a full uninterrupted charge cycle without powering on the laptop. Once it reaches 100%, the EEPROM syncs with the BIOS and the charge display corrects itself.

Windows is showing the wrong Wh rating for this battery — it says 48Wh but the battery is 73.26Wh. What causes that?

The Wh figure Windows reports comes from the EEPROM on the battery's BMS board, not from the physical cells. If the EEPROM was written at the factory with a rated value from a different capacity variant in the same product family, Windows reads that stored figure rather than measuring the actual chemistry. This is a data mismatch, not a fault with the cell. Run a full discharge-to-hibernate cycle followed by a full charge — this triggers the fuel gauge IC to update its learned capacity and Windows will then report a value closer to the actual 73.26Wh.

The fuel gauge on my EX600 jumps around wildly — 60% one minute, 35% the next. Is the battery defective?

It is not defective. The fuel gauge IC in the MSI EX600 uses a stored discharge curve from the previous cell to estimate remaining capacity. A new cell with different internal resistance causes the IC to misread voltage as a percentage, producing erratic jumps. The IC needs two to three full discharge-and-charge cycles to map the new cell's actual curve. After those calibration cycles, the gauge reading will stabilise — confirm by checking that charge drops smoothly through 11.1V down toward the 9V cutoff range without large jumps.

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