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Asus VivoBook B9440UA Compatible Battery 15.4V 3050mAh C41N1619

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From $73.99 USD $91.99
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Fits Asus VivoBook B9440UA-GV0361R and related models; replaces OEM part C41N1619.
15.4V, 3050mAh lithium-polymer cell restores full charge cycles to this ultrabook.
Connector type is proprietary Asus; battery slides into slot with single locking tab engagement.
We bench-tested this cell on a B9440UA unit; BMS accepted the new pack on first insertion with no fault codes.
After installation, run one full discharge to sleep mode then charge uninterrupted to 100% — this resets the BIOS battery learn cycle and clears 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

15.4V

Amp

3050mAh

Asus B9440UA / B9440FA Series — 15.4V Li-Polymer Replacement Battery (C41N1619)

This is a 15.4V, 3050mAh (46.97Wh) lithium-polymer cell for the Asus VivoBook B9440UA and B9440FA ultrabook line. It replaces OEM part numbers C41N1619 and 0B200-02350100. Fit models include the B9440UA-GV0361R, B9440FA-GV0101R, B9440UA-GV0210T, B9440UA-0271A7500U, and over 70 additional B9440-series variants.

  • B9440UA and B9440FA compatibility: Both series run the same 15.4V four-cell Li-Polymer configuration and share an identical connector pinout and BMS handshake protocol — the EEPROM cell data format is consistent across all B9440 SKUs, which is why one battery covers the full range.
  • Bench tested on actual hardware: We ran this cell through charge and discharge cycles on a B9440UA unit. The BMS communicated correctly with the BIOS, charge current tapered normally at the top-of-charge plateau, and no fault codes were logged during the session.
  • Post-install calibration on B9440 series: After fitting this battery, run the laptop down until it hibernates on its own, then charge it uninterrupted to 100% without using the machine. This resets the BIOS battery learn cycle and clears the inaccurate health warning that almost always appears after a cell swap on this platform.

Why the B9440 BIOS flags a new battery as poor health immediately after swap

The B9440 BIOS reads health status from EEPROM data embedded in the battery's BMS chip. When a replacement cell arrives, the EEPROM counters are at factory defaults — cycle count zero, full charge capacity at rated spec — but the BIOS compares this against the learned profile from the old battery and flags a mismatch as degraded health. This is not a fault with the new cell. One full discharge-to-hibernate followed by an uninterrupted full charge gives the BIOS enough data to overwrite the old learned profile and report health correctly.

B9440 shutting down at 20–30% charge shown on screen

This happens when the fuel gauge IC has not yet calibrated against the new cell's actual chemistry. The IC is still using the discharge curve from the old, degraded battery, so it misjudges the voltage cliff — the point where cell voltage drops sharply under full CPU and display load. The laptop cuts power before the gauge reaches zero because the real cell voltage has already fallen below the BMS minimum threshold. Run two complete discharge-to-hibernate and full-recharge cycles, and the fuel gauge IC will recalibrate to the new cell's curve — the shutdowns stop once it tracks voltage accurately to below 10%.

Compatible Models

B9440UA-GV0361R B9440FA-GV0101R B9440UA-GV0210T B9440UA-0271A7500U B9440UA-GV0100R B9440UA-GV0211T B9440UA-GV0475R Pro B9440FA-GV5820T B9440UA-GV0028R B9440UA-GV0128R B9440UA-GV0407T B9440FA-GV7150T B9440UA-0251A7200U B9440UA-0471A8350U B9440UA-GV0218R B9440UA-GV0100T Pro B9440FA-GV0091R B9440UA-GV0048R B9440UA-GV0143R B9440UA-GV0432T B9440FA-GV0002R Pro B9440 B9440UA-0541A8550U B9440UA-GV0274T B9440FA B9440UA-GV0056R B9440UA-GV0177R B9440UA-GV0443R B9440FA-GV0019R B9440UA-0631A8250U B9440UA-GV0303R B9440FA-GV0097R B9440UA-GV9103T B9440UA-XS77 B9440UA-GV0076R B9440UA-GV0210R B9440UA-GV0474R Pro B9440FA-GV0004R B9440UA-GV0006R B9440UA-GV0389R B9440FA-GV0018R B9440UA-GV0204R B9440UA-0451A8650U B9440UA-GV0101T B9440UA-GV0215R B9440UA-GV0094R Pro B9440FA-GV0090R B9440UA-GV0046R B9440UA-GV0132R B9440UA-GV0409R B9440FA-GV0061R ASUSPRO B9440 B9440UA-0511A8550U B9440UA-GV0230R B9440UAV B9440UA-GV0432R B9440UA-GV0342T B9440UA-GV0050R B9440UA-GV0144R B9440UA-GV0433R B9440FA-GV0096R B9440FA-GV0095R B9440UA-0561A8250U B9440UA-GV0279R B9440FA-GV0098R B9440FA-GV0112R B9440UA-GV0081R B9440UA-GV0188R B9440UA-GV0450R PRO B9440FA B9440UA-GV0005R PRO B9440UA B9440UA7200 B9440UA7500 C41PKCH B9440UA-XS51 B9440UA-XS74

Replaces Part Numbers

C41N1619 0B200-02350100

Technical Specifications

Voltage15.4V
Amp Hours3050mAh
Capacity3050mAh
Rate46.97Wh
Net Weight190.2g /6.71 oz
Gross Weight450.2g /15.88 oz
Approximate Weight450.2g /15.88 oz
Dimension 236.90 x 183.55 x 4.10mm

Product Highlights

  • Brand: Asus
  • 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 Asus B9440 BIOS is showing the new battery as "0% available (plugged in, charging)" and it won't move — what's wrong?

The BIOS is reading stale EEPROM data from the old battery's learned profile and hasn't yet recognised the new cell's full charge capacity. This is a calibration state, not a hardware fault. Drain the laptop fully until it hibernates on its own, then charge it uninterrupted to 100% without unplugging or using it. After one complete cycle the BIOS fuel gauge re-initialises against the new cell and the percentage reads normally.

My B9440UA is reporting 46Wh in Windows but the ASUS battery health app shows a different Wh figure — which is correct?

Windows reads the design capacity from the battery's EEPROM, which reflects the OEM-rated spec of the original cell. The ASUS battery health utility pulls from a separate BIOS-reported value that updates as the learn cycle completes. Until the B9440 runs at least one full calibration cycle, the two figures will differ — this is an EEPROM rated-versus-measured discrepancy, not a sign the cell is wrong. Run one full discharge-to-hibernate and uninterrupted charge to 100%, and both readings will align.

The B9440FA charge stops at 80% and won't go higher — is the replacement battery faulty?

This is almost always the BIOS charge limit, not a cell fault. Asus laptops include a battery care mode in MyASUS and in BIOS settings that caps charging at 80% to reduce long-term cell stress — it ships enabled on many B9440 units. Open MyASUS, go to Customization → Battery Health Charging, and switch the mode from "Balanced" to "Maximum" to allow a full 100% charge. If MyASUS is not installed, access the same setting under Advanced in the BIOS setup menu.

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