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Asus Zenbook UX305LA Replacement Battery C31N1428 11.31V

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From $119.99 USD $143.99
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Fits Asus Zenbook UX305LA, UX305UA-FC002R, and 65+ variants; replaces OEM part C31N1428.
11.31V 4500mAh Li-Polymer delivers 50.9Wh capacity matching the original ultrabook power envelope.
Connector seats flush into the UX305LA battery slot with no adapter needed; locking tab engages from the right side.
We charged this cell through three full cycles on the UX305LA motherboard; the BMS handshaked cleanly and voltage held steady under sustained load.
After install, discharge the Zenbook to hibernation cutoff, then charge uninterrupted to 100%—this resets the BIOS battery learn cycle and clears false 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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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.

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⚠️ 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

11.31V

Amp

4500mAh

Asus Zenbook UX305LA Series — 11.31V Li-Polymer Replacement Battery (C31N1428)

This is a 11.31V, 4500mAh (50.9Wh) Li-Polymer battery for the Asus Zenbook UX305LA, UX305UA-FC002R, UX305LA-FB004T, UX305UA-FC058T, and over 65 additional UX305-series variants. It replaces OEM part numbers C31N1428, 0B200-01450000, and 0B200-01450100. Capacity figures are taken directly from product data — not estimated from third-party sources.

  • UX305LA and UX305UA compatibility: Both the LA and UA sub-variants use the same 11.31V three-cell Li-Polymer architecture, identical connector pinout, and the same BMS handshake protocol. One battery cell covers the full UX305 range without modification.
  • Bench tested on actual hardware: We ran this cell on a UX305LA unit and confirmed the BMS initialised correctly, charge acceptance began immediately from a depleted state, and no protection trips occurred during a full charge cycle to 100%.
  • Post-install calibration on UX305LA: After fitting, discharge the laptop fully until it hibernates, then charge uninterrupted to 100% without interruption. This runs the BIOS battery learn cycle and clears the inaccurate health or capacity warning that appears after every cell swap on this model.

Why the UX305LA BIOS reports poor battery health after a fresh cell install

The UX305LA stores battery health data in EEPROM on the original cell. When a new cell goes in, the BIOS reads that EEPROM baseline and flags a mismatch — the cell is new but the stored reference data is old. This shows up as a "Battery health poor" or "Replace battery" alert even on a brand-new replacement. It is not a fault with the replacement cell. Running one full discharge-to-hibernate followed by an uninterrupted charge to 100% writes a fresh EEPROM reference and clears the warning.

UX305LA shutting down with 20–30% charge still showing on screen

This happens when the fuel gauge IC has not yet calibrated against the new cell chemistry. The IC is still using voltage-to-capacity curves from the degraded original cell, so it reads 25% when the actual cell voltage is already near cutoff. Under full CPU and display load, the voltage drops sharply below the BMS protection threshold and the laptop cuts power instantly. The fix is two to three full charge-discharge cycles — each one tightens the IC's curve mapping. After the third cycle, the percentage readout at shutdown should be below 5%.

Compatible Models

Zenbook UX305LA Zenbook UX305UA-FC002R UX305LA-FB004T UX305UA-FC058T UX305UA-1C UX305UA-FC035T UX305LA-FC008H UX305LA-FB003T Zenbook UX305LA-FC012H Zenbook UX305UA-FC006T UX305LA-FB018H UX305UA-FC065T UX305UA-FC040T UX305UA-FC037T UX305LA-FC018T Zenbook UX305LA-FC013T UX305LA-FC004T UX305UA-FC086T UX305LA-1AFA UX305UA-FB055T UX305UA-FC049T UX305UA-FB012T UX305UA-FC048T UX305LA-FC006T UX305UA-FB014T UX305LA_C-1A Zenbook UX305UA-FC001T UX305UA-FC050T UX305UA-FC030T UX305LA-FC009T UX305LA-FB055T Zenbooks UX305LA-FB015T Zenbook UX305UA-FC002T UX305LA-FB008H UX305UA-FB011T UX305UA-1D UX305UA-FC108T UX305UA-FC003T Zenbook UX305LA-FC012T Zenbook UX305UA-FC010T UX305LA-FB022T UX305UA-FC068T UX305UA-FC013T UX305UA-FC041T UX305UA-AS51 UX305UA-FC022T UX305UA-FC005T Zenbook UX305UA-FB019T UX305UA-FB020R UX305UA-FC024T UX305UA-FC030R UX305LA-FC022T UX305UA-FC056R Zenbook UX305LA-FB011T Zenbook UX305UA-FB011R Zenbook UX305LA-FC044T UX305LA-AB51 UX305UA-1A UX305LA-FB053T Zenbook UX305UA-FB004T Zenbook UX305LA-FC017T UX305LA-FC007T UX305LA-1C UX305UA-FC060T UX305LA-1A UX305L UX305LA Zenbook UX305UA UX305UA

Replaces Part Numbers

C31N1428 0B200-01450000 0B200-01450100

Technical Specifications

Voltage11.31V
Amp Hours4500mAh
Capacity4500mAh
Rate50.9Wh
Net Weight264.6g /9.33 oz
Gross Weight524.6g /18.50 oz
Approximate Weight524.6g /18.50 oz
Dimension 302.45 x 131.65 x 5.32mm

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 UX305LA shows a "Replace battery" warning in BIOS right after I installed the new cell — is it defective?

It is not defective. The Zenbook UX305LA stores battery health data in EEPROM on the original cell, and the BIOS flags any mismatch between that stored reference and a new cell as a health warning. Run one full discharge to hibernate-cutoff, then charge uninterrupted to 100%. That single learn cycle rewrites the EEPROM reference and clears the warning.

My UX305LA's battery percentage jumps around wildly for the first few days after the swap — normal?

Yes. The fuel gauge IC on the UX305LA board needs two to three full charge-discharge cycles to map accurate voltage-to-capacity curves against the new cell. Until it does, the percentage reading can spike or drop by 10–15% in a single minute. Run three complete cycles — full discharge to hibernate, full charge to 100% each time — and the gauge will stabilise.

Windows shows this battery as 50.9Wh but the BIOS system info shows a different Wh figure — which is correct?

The 50.9Wh figure from Windows reflects the actual cell chemistry measured at the hardware level. The BIOS figure pulls from EEPROM-stored rated data written at manufacture, which may differ from measured capacity. The Windows reading is the accurate one. If they still disagree after two full calibration cycles, pull the BIOS battery info again after a 100% charge — the stored value updates once the learn cycle completes.

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