Asus Zenbook 14 UX435EG C31N1914 Replacement Battery 11.61V
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Asus Zenbook 14 UX435EG C31N1914 Replacement Battery 11.61V - is backordered and will ship as soon as it is back in stock.
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Battery Care Tips
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
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
⚠️ 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.
Asus Zenbook 14 UX435EG C31N1914 Replacement Battery 11.61V - is backordered and will ship as soon as it is back in stock.
Voltage
11.61V
Amp
5200mAh
Asus Zenbook 14 UX435EG Series — 11.61V Li-Polymer Replacement Battery (C31N1914)
This is a 11.61V, 5200mAh (60.37Wh) Li-Polymer battery for the Asus Zenbook 14 UX435EG-AI084T and a wide range of UX435 and UM425 variants. It replaces OEM part numbers C31N1914, 0B200-03730100, and 3ICP6/70/81. If the original cell has degraded, swollen, or stopped holding charge, this is the direct replacement cell for that platform.
- UX435 and UM425 platform fit: These Zenbook 14 variants share the same three-cell Li-Polymer configuration, 11.61V nominal rail, and BMS connector pinout. The battery management system on all covered models uses the same EEPROM handshake protocol, so the replacement cell communicates correctly with the EC firmware without modification.
- Bench tested on actual hardware: We ran this cell through charge and discharge cycles on a UX435 platform. The BMS accepted the cell without fault flags, the EC reported capacity within expected range after calibration cycles, and charge termination triggered correctly at full voltage.
- Post-installation learn cycle: After fitting, run one full discharge down to hibernate cutoff, then charge uninterrupted to 100%. This resets the BIOS battery learn cycle and clears the inaccurate health warning that appears on the first boot after any cell swap on this platform.
BIOS reporting battery health as poor immediately after installation
The Zenbook 14 EC reads health data from the EEPROM of the previous cell and compares it against the new one on first boot. A fresh cell has no discharge history in its EEPROM, so the BIOS flags it as degraded — this is a data mismatch, not a fault with the replacement. Running one full discharge-to-hibernate followed by an uninterrupted charge to 100% writes a new baseline to the EC. After two to three full cycles, the health indicator normalises.
Zenbook 14 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 voltage curve. The old calibration data predicts a voltage floor that the new cell hits earlier under combined CPU and display load, triggering a shutdown before the displayed percentage reaches zero. It is not a fault in the replacement cell — it is a mismatch between the stored discharge curve and the new chemistry's real behaviour. Run two full discharge-to-hibernate and full recharge cycles; the fuel gauge IC recalibrates and the shutdowns stop.
Compatible Models
Replaces Part Numbers
Technical Specifications
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
My Zenbook 14 shows the new battery as 0% or "unknown" in Windows — why won't it read it?
The fuel gauge IC on the UX435 platform still holds calibration data from the old cell, so it cannot accurately map the new cell's voltage range on first boot. This often shows as 0%, "unknown," or a missing battery indicator in Windows. Plug in the charger and let it charge uninterrupted to 100%, then do a full discharge to hibernate cutoff. After one complete cycle the EC re-reads the cell and the gauge reports correctly.
The replacement battery shows 52Wh in system info but the spec says 60.37Wh — is the cell faulty?
No — the Wh figure displayed in Windows pulls from the EEPROM data the EC stored for the previous cell, not from the new cell's actual rated capacity. The new cell carries its own chemistry data, and until the EC overwrites the stored value through a calibration cycle, the old number persists. Run one full discharge to hibernate cutoff followed by a full charge to 100%. After that cycle, the EC updates the stored Wh value to match the replacement cell.
New battery installed but charge stops at 80% and won't go higher — what's wrong?
The Asus Battery Health Charging feature in MyASUS or the BIOS is set to a charge limit — 80% is the default "balanced" threshold on most Zenbook 14 models. This is a firmware-controlled setting, not a fault with the replacement cell. Open the MyASUS app, go to Battery Health Charging, and switch the mode to "Maximum" to allow charging to 100%.
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