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Asus ZenBook 13 UX331UN Compatible Battery 11.55V 4150mAh

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From $97.99 USD $117.99
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Replaces Asus C31N1724 and 0B200-02760400 battery packs for ZenBook 13 UX331UN-EG011T and compatible models.
11.55V and 4150mAh Li-Polymer chemistry restores full charge cycles on this ultrabook without voltage sag during CPU and display load.
Connector seats flush into the battery slot beneath the keyboard; no locking tab — slides in straight and clips down.
We bench-tested the C31N1724 cell against the BMS on stock firmware; charge accepted cleanly, no fault codes, voltage held steady under 15W sustained draw.
Run one full discharge to hibernation-cutoff, then charge uninterrupted to 100% to reset the BIOS battery learn cycle and clear inaccurate health warnings that appear after 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.

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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.

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🔹 We use these names, brands, or model numbers only for identification and compatibility purposes.

Voltage

11.55V

Amp

4150mAh

Asus ZenBook 13 UX331UN / UX331FA Series — 11.55V Li-Polymer Replacement Battery (C31N1724)

This is a 11.55V, 4150mAh (47.93Wh) Li-Polymer battery for the Asus ZenBook 13 UX331UN-EG011T and related UX331 ultrabooks. It replaces OEM part numbers C31N1724 and 0B200-02760400. Fit covers the UX331UN, UX331FA, UX331FAL, and U3100FAL lines.

  • UX331 platform compatibility: The UX331 series runs a shared 3-cell Li-Polymer pack across multiple sub-models. All variants use the same 11.55V voltage rail, identical connector pinout, and the same BMS handshake protocol — which is why one cell covers both the UN and FA chassis revisions.
  • Bench tested on actual hardware: We ran this cell through charge and discharge cycles on the UX331 platform. The BMS accepted the pack without fault codes, charge termination triggered correctly at full capacity, and thermal cutoff engaged as expected during stress testing.
  • Post-install calibration on ZenBook firmware: After fitting this cell, run one full discharge until the laptop hibernates on low battery, then charge uninterrupted to 100%. This resets the BIOS battery learn cycle and clears the inaccurate health warning that appears on first boot after a cell swap.

Why the ZenBook 13 shuts down at 20–30% after a battery swap

The UX331 BIOS stores a discharge curve mapped to the original cell's chemistry profile. When a new cell is fitted, that stored curve no longer matches actual cell voltage under load. At around 20–30% shown, the new cell's voltage under full CPU and display load drops below the BIOS cutoff threshold — even though charge remains. Running two to three full discharge-to-hibernate and full-recharge cycles lets the fuel gauge IC re-map its curve against the new cell and eliminates the early shutdown.

BIOS reporting battery health as "poor" or "replace" immediately after fitting

The health status on the UX331 reads from EEPROM data written by the old cell — not from any live measurement of the new pack. On first boot, the BIOS sees cycle count and wear data from the previous cell's EEPROM and flags it as degraded. This is not a fault with the replacement cell. Run the full discharge-and-recharge calibration cycle, and on most UX331 units the health status clears within two cycles. If MyASUS still shows a warning after three calibration cycles, check that BIOS is updated to the latest version for your sub-model.

Compatible Models

ZenBook 13 UX331UN-EG011T U3100FAL ZenBook 13 UX331FAL-EG075T Zenbook 13 UX331FA-EG007T ZenBook 13 UX331FAL-EG027R Zenbook UX331FAL-BH71 ZenBook 13 UX331UAL-EG022R Zenbook 13 UX331FAL-EG501T ZenBook 13 UX331U-NEG103T Zenbook UX331FAL-EG028T ZenBook 13 UX331FAL-EG016T ZenBook 13 UX331UAL-EG053T ZenBook 13 UX331UN-WS51T ZenBook 13 UX331UN-EG009T ZenBook 13 UX331UN-EG080T Zenbook UX331FAL-EG002T ZenBook 13 UX331UAL-EG041T ZenBook 13 UX331UAL-EG867T ZenBook 13 UX331Un-M00250 ZenBook 13 UX331FAL-EG017R ZenBook 13 UX331FA-DB71 ZenBook 13 UX331FAL-EG050T Zenbook UX331FAL-EG027R ZenBook 13 UX331UAL-EG050T ZenBook 13 UX331FAL-EG002T ZenBook 13 UX331UN-EG002T UX331FAL ZenBook 13 UX331FAL-EG003T Zenbook 13 UX331FA-EG006T ZenBook 13 UX331FAL-EG048T Zenbook UX331FAL-EG013T ZenBook 13 UX331UAL-EG020TS ZenBook 13 UX331FAL-EG044T ZenBook 13 UX331UN-EG091T Zenbook UX331FAL-EG017R Zenbook 13 UX331FAL-BS8205E ZenBook 13 UX331UAL-EG003T Zenbook UX331FAL-BS8202T ZenBook 13 UX331FA-EG002T ZenBook 13 UX331UN-EG030T ZenBook 13 UX331UN-EG078R Zenbook UX331FAL-EG006T ZenBook 13 UX331FNL-DH51T ZenBook 13 UX331UAL-EG106T ZenBook 13 UX331FAL-EG028T ZenBook 13 UX331FA-AS51 ZenBook 13 UX331UN-EG030R ZenBook 13 UX331UN-EA087T Zenbook UX331FAL-EG009T ZenBook 13 UX331UAL-EG052T ZenBook 13 UX331UAL-EG868T Zenbook 13 UX331UN-EG006T ZenBook 13 UX331U ZenBook 13 UX331FAL-EG039T ZenBook 13 UX331FA-A3071T ZenBook 13 UX331FAL-EG013R Zenbook UX331FAL-EG013R ZenBook 13 UX331UA-EG039T ZenBook 13 UX331FAL-EG033T

Replaces Part Numbers

C31N1724 0B200-02760400

Technical Specifications

Voltage11.55V
Amp Hours4150mAh
Capacity4150mAh
Rate47.93Wh
Net Weight197g /6.95 oz
Gross Weight457g /16.12 oz
Approximate Weight457g /16.12 oz
Dimension 247.57 x 103.40 x 8.40mm

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 ZenBook shows 100% charge but drops to 15% within minutes — is the fuel gauge broken or is it the cell?

The fuel gauge IC on the UX331 platform calibrates against the old cell's discharge curve stored in EEPROM. With a new cell fitted, that stored curve is wrong, and the displayed percentage jumps around until the IC re-learns the new cell's actual voltage profile. Run two full discharge cycles — let the laptop hibernate on low battery each time, then charge uninterrupted to 100%. By the third cycle the gauge reading should stabilise.

MyASUS is showing the wrong Wh rating — it says 39Wh or similar instead of 47.93Wh — is something wrong with the battery?

The Wh figure shown in MyASUS and Device Manager pulls from EEPROM data, which can reflect the rated value stored by the old cell rather than the actual chemistry of the replacement pack. This is a data mismatch between the EEPROM record and the new cell — not a capacity fault. After running the full calibration cycle (discharge to hibernate, charge to 100%), the reported Wh figure on most UX331 units will update to match the actual cell. Confirm the final reading in MyASUS under Battery Health Charging.

New battery charges to about 80% then stops — ZenBook won't charge past that point no matter how long it sits on the charger.

The UX331 ships with Asus Battery Health Charging enabled in BIOS by default — this is a firmware-controlled charge limit, not a battery fault. It caps charging at 80% (Balanced mode) or 60% (Maximum Lifespan mode) to reduce cell stress. Open MyASUS, go to Customization → Battery Health Charging, and switch the setting to Full Capacity Mode. The battery will then charge to 100%.

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