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Clevo W655SF 11.1V Replacement Battery 6-87-W650S-4D4A1

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From $75.99 USD $93.99
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Fits Clevo W655SF and replaces OEM part numbers 6-87-W650S-4D4A1, 6-87-W650S-4D4A2, 6-87-W650S-4D4A3, and W650BAT-6.
11.1V, 4400mAh cell delivers 48.84Wh — the stock capacity for this mid-range gaming notebook under sustained CPU and GPU load.
Connector slides into the battery bay with a single latching tab on the right side of the housing.
Bench testing showed the BMS regulated current draw under full-load gaming and held voltage stable through discharge cycles.
After installation, fully discharge the notebook to hibernation, then charge uninterrupted to 100% — this resets the BIOS battery learn cycle and clears inaccurate health warnings.
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

4400mAh

Clevo W655SF Series — 11.1V Li-ion Replacement Battery (6-87-W650S-4D4A1)

This is an 11.1V, 4400mAh (48.84Wh) Li-ion replacement battery for the Clevo W655SF and related notebooks. It fits a broad range of W650/W655/W670 series models sharing the same battery bay and connector geometry. Install it when the original cell no longer holds a useful charge or fails to register in the OS.

  • W650/W655/W670 series compatibility: These models share the same 11.1V three-cell architecture, identical connector pinout, and BMS communication protocol over the SMBus line — which is why one part number covers the full range. The EEPROM data embedded in this cell matches what the Clevo EC firmware expects to read on first handshake.
  • Bench tested on actual hardware: We ran this cell through full charge and discharge cycles on W655-series hardware. The BMS completed charge termination cleanly at 12.6V, and the EC reported accurate state-of-charge without triggering a fault code or unknown-battery warning.
  • First-cycle calibration on W655 series: After installation, run one full discharge down to hibernate-cutoff, then charge uninterrupted to 100%. This forces the fuel gauge IC to map its thresholds against the new cell and clears the inaccurate health warning that the BIOS flags after every cell swap.

BIOS reporting poor battery health immediately after fitting a new cell

The Clevo EC reads EEPROM data stored on the battery's BMS chip and compares it against cycle count and rated capacity. A brand-new cell still carries factory-default EEPROM values that the EC sometimes interprets as a degraded or foreign battery. This triggers the "battery health poor" or "unknown battery" flag in the BIOS health screen before a single charge cycle has run. One full discharge-to-hibernate followed by an uninterrupted charge to 100% lets the EC re-learn the cell's actual voltage curve and clears the flag on next boot.

Laptop shuts down abruptly at 20–30% charge shown on screen

This is a voltage cliff, not a calibration error. Under full CPU and display load the cell voltage drops faster than the fuel gauge IC can track, and the EC triggers an emergency shutdown before the displayed percentage reaches zero. It usually means the fuel gauge was never calibrated against the new cell after installation. Run the full discharge-to-hibernate cycle once — this gives the fuel gauge IC real load data to anchor its low-voltage cutoff prediction. After calibration the shutdown threshold should align with the displayed percentage at or below 5%.

Compatible Models

W655SF W655SZ W655RN W670SBQ1 W670SZQ1 W670RZW W651DC W670RBQ W670SRQ W670SCQ1 W650RC1 W670RNQ1 W665SZ W651SC W670SFQ1 W655RC1 W670RCW1 W670RZQ W650RZ1 W655SC W651RN W670SBQ W655RZ1 W655SJ S650SC W650SB W670SCQ W670RZW1 W670RNQ W670RBQ1 W651SB W670SFQ W651RC1 W670RCW W670RCQ1 W651SZ W655SB W670SJQ1 W650RN W670RZQ1 W651RZ1 W670RCQ W650RC W650DC W670SJQ w670sc W650SZ W651SJ W651SF W650RB W670SZQ W650RZ W650SF W650SR W650SC W650SJ W670SR W650SH W670

Replaces Part Numbers

6-87-W650S-4D4A1 6-87-W650S-4D4A2 6-87-W650S-4D4A3 6-87-W650S-4D4A5 6-87-W650S-4D7A2 6-87-W650S-4E7 6-87-W650S-4E72 W650BAT-6

Technical Specifications

Voltage11.1V
Amp Hours4400mAh
Capacity4400mAh
Rate48.84Wh
Net Weight306g /10.79 oz
Gross Weight576g /20.32 oz
Approximate Weight576g /20.32 oz
Dimension 269.00 x 50.60 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

The W655SF BIOS shows my new battery as "0% available (plugged in, not charging)" right after install — what's wrong?

The EC hasn't completed its handshake with the new cell's BMS chip yet. Power off completely, remove the AC adapter, hold the power button for 10 seconds to drain residual charge from the board, then reconnect AC and boot. This forces the EC to re-poll the SMBus line and re-read the EEPROM on the new cell. If the 0% reading persists, run one full hibernate-cutoff discharge followed by an uninterrupted charge to 100% to complete the learn cycle.

Windows shows the battery at 48Wh rated capacity but the BIOS energy screen displays a different Wh figure — is the cell wrong?

The figure in the BIOS pulls from the EEPROM's design-capacity register on the BMS chip, which reflects the cell chemistry's nominal rated value at the time of manufacture. Windows reads actual full-charge capacity reported by the fuel gauge IC after it has run calibration cycles, so the two numbers will differ until the fuel gauge has mapped the new cell's real voltage curve across at least one complete discharge. Run two full discharge-to-hibernate and uninterrupted-charge cycles and the figures will converge closer to the 48.84Wh value in the product data.

The W655SF fuel gauge jumps erratically — showing 60%, then 45%, then back to 55% within minutes under normal use — is this a faulty cell?

This is fuel gauge IC drift, not a defective cell. The IC's internal model is still mapped to the old cell's voltage-to-capacity curve, so it misreads the new cell's discharge profile and produces unstable percentage estimates. It is not reporting actual charge loss — the underlying cell voltage is stable. Run two consecutive full discharge-to-hibernate cycles with an uninterrupted charge to 100% after each one. After the second cycle the IC recalibrates its lookup table and the percentage reading stabilises.

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