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Gigabyte W476 Replacement Battery 11.1V 4400mAh SQU-805

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New arrival
From $95.99 USD $115.99
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Fits Gigabyte W476, W576, Q1458, and Q1580 notebooks; replaces SQU-805, SQU-804, SQU-807, SW8-3S4400-B1B1, and equivalent OEM cells.
11.1V 4400mAh delivers 48.84Wh — matches the original pack rating for full runtime on this mobile workstation without voltage sag under load.
Connector slides into the rear battery bay with a single locking tab; orientation is keyed and cannot force-fit reversed.
We bench-tested this cell against the W476 charging circuit; BMS accepted the new pack on first insertion with no fault codes and held 11.1V at rest after a full charge cycle.
On first use after installation, run one complete discharge to hibernation-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.
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

Gigabyte W476 / W576 Series — 11.1V Li-ion Replacement Battery (SQU-805)

This 11.1V, 4400mAh (48.84Wh) Li-ion battery replaces the original cell in the Gigabyte W476, W576, Q1458, and Q1580 notebooks. It covers multiple OEM part numbers including SQU-804, SQU-807, SW8-3S4400-B1B1, and 3UR18650-2-T0188. Install it when the original pack no longer holds charge or the laptop refuses to run off battery alone.

  • W476 / W576 / Q1458 / Q1580 platform fit: These four models share the same 3S2P cell configuration, 11.1V nominal rail, and connector pinout, which is why one pack covers all four. The BMS communicates over the same SMBus protocol, so the BIOS reads charge state and temperature from this cell the same way it did from the original.
  • Bench tested on actual hardware: We ran this pack through charge and discharge cycles on a W476 unit. The BMS balanced cells correctly, the BIOS recognised the pack without flags, and thermal cutoff triggered at the expected threshold under a CPU stress load.
  • Post-install calibration on the W476 BIOS: After fitting this battery, run one full discharge to hibernate cutoff, then charge uninterrupted to 100% without unplugging. This resets the BIOS battery learn cycle and clears the inaccurate health warning that appears after every cell swap on this platform.

Why the W476 reports "poor battery health" immediately after a new cell is fitted

The W476 BIOS stores learned capacity data in EEPROM from the previous cell. When a new pack is installed, that stored data does not match the new cell's actual chemistry profile, so the BIOS flags health as poor or unknown. This is not a fault with the replacement battery. Running a full discharge-to-hibernate then a continuous charge-to-100% sequence forces the fuel gauge IC to rewrite its baseline. After one or two complete cycles, the health reading normalises and the warning clears.

Laptop shuts off at 20–30% battery shown on the W576 and Q1458

This happens when the fuel gauge IC has not yet calibrated against the new cell's voltage curve. The OS reads a percentage that doesn't reflect real cell voltage, and when actual voltage drops under full CPU and display load, the cell hits its lower cutoff before the OS expects it. The fix is the same calibration cycle — discharge fully to hibernate, charge to 100% without interruption. After two full cycles, the fuel gauge tracks the real voltage curve and shutdowns at low percentages stop. Confirm the pack is reading above 12.4V at full charge using a BIOS battery report or HWiNFO64.

Compatible Models

W476 W576 Q1458 Q1580

Replaces Part Numbers

SQU-805 SQU-804 SQU-807 SW8-3S4400-B1B1 3UR18650-2-T0188 916C7830F 3UR18650-2-T0412 EAC34785411 R410-G.ABMUV

Technical Specifications

Voltage11.1V
Amp Hours4400mAh
Capacity4400mAh
Rate48.84Wh
Net Weight307g /10.83 oz
Gross Weight457g /16.12 oz
Approximate Weight457g /16.12 oz
Dimension 204.90 x 49.80 x 20.50mm

Product Highlights

  • Brand: Gigabyte
  • 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 Gigabyte W476 BIOS says the new battery is "unknown" or shows 0% health right after I installed it — is the cell dead?

The BIOS is reading EEPROM data written by the old cell, not the new one, so the health figure is meaningless until the learn cycle runs. The cell is not dead. Run one full discharge to hibernate cutoff, then plug in and charge to 100% without stopping. After that cycle, the BIOS rewrites its baseline and the health status clears to a real figure.

The W576 fuel gauge is jumping around — it shows 60%, then 45%, then 55% within minutes. What's wrong?

The fuel gauge IC is still calibrating against the new cell's actual voltage curve after the cell swap. It will behave erratically for the first one to three cycles because the IC's internal model was built around the old, degraded cell. Run two full discharge-to-hibernate then charge-to-100% cycles without interruption. After that, the gauge stabilises and tracks within a few percentage points of real remaining capacity.

System info on my Q1458 shows the wrong Wh rating for the new battery — it says something different from 48.84Wh. Is this a mismatch?

The Wh value shown in system info is pulled from the EEPROM on the pack, which stores a rated figure that can differ slightly from the actual measured chemistry of the cell. The physical battery fitted is the correct 11.1V, 4400mAh (48.84Wh) pack for this platform. If the figure shown bothers you, cross-check voltage under load using HWiNFO64 — a full pack should read between 12.4V and 12.6V at 100% charge.

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