Asus ZenBook 14 UX433FN Replacement Battery C31N1811 11.55V
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Asus ZenBook 14 UX433FN Replacement Battery C31N1811 11.55V - 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 UX433FN Replacement Battery C31N1811 11.55V - is backordered and will ship as soon as it is back in stock.
Voltage
11.55V
Amp
4250mAh
Asus ZenBook 14 UX433FN Series — 11.55V Li-Polymer Replacement Battery (C31N1811)
This is a 11.55V, 4250mAh (49.09Wh) Li-Polymer battery for the Asus ZenBook 14 UX433 series. It replaces OEM part numbers C31N1811 and 0B200-03080000. Confirmed fit includes the UX433FN-BP8201T, UX433FN-A5080T, UX433FA-A5187R, UX433FA-A5188R, and over 114 additional UX433 variants.
- UX433 platform compatibility: Every UX433 variant in this series shares the same three-cell Li-Polymer configuration, 11.55V voltage rail, and C31N1811 BMS handshake. The connector pinout and physical footprint are consistent across the entire UX433FA and UX433FN production run, so one cell fits the full range.
- Bench tested on actual hardware: We ran this cell on a UX433FN and confirmed the BMS negotiated charge current correctly, cell voltage held stable across light and heavy CPU loads, and the BIOS recognised the battery without error on first boot.
- Post-install calibration on the UX433: After fitting, run the laptop on battery until it shuts down at the low-voltage cutoff, then charge uninterrupted to 100% without using the machine. This forces the BIOS battery learn cycle to reset against the new cell and clears the inaccurate health warning that appears after every cell swap on this platform.
BIOS reporting poor battery health immediately after fitting a new C31N1811 cell
The ZenBook's BIOS stores battery health data in EEPROM tied to the original cell's cycle count and capacity history. When a new cell is fitted, that stored data does not reset automatically — the BIOS reads the old figures and flags the new battery as degraded. This is not a fault with the replacement cell. Running one complete discharge-to-cutoff followed by a full uninterrupted charge clears the learned values and forces the BIOS to record a fresh baseline against the new cell's actual capacity.
Laptop shuts down at 20–30% charge shown on the UX433 fuel gauge
This happens when the fuel gauge IC's stored discharge curve no longer matches the new cell's chemistry. The IC predicts shutdown voltage based on old cell data and triggers a cutoff while the display still shows charge remaining. It is not a fault with the cell itself. Run two to three full discharge-to-hibernate cycles followed by full charges — the fuel gauge IC recalibrates its curve against the new cell and the percentage readings stabilise. After calibration, voltage at shutdown should read no lower than 10.0V under load.
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
The ZenBook BIOS shows the new battery as "unknown" or 0% — is the cell dead?
The BIOS reads health data from EEPROM written by the original cell, so a brand-new cell with no stored history triggers this warning immediately. The cell itself is fine. Boot into Windows, let the laptop discharge fully until it hibernates, then charge uninterrupted to 100%. After that cycle, the BIOS rewrites the EEPROM baseline and the unknown status clears.
My ZenBook is only charging to 80% and stops — did I get a faulty battery?
This is a BIOS-controlled charge limit, not a cell fault. Asus ships many ZenBook units with Battery Health Charging enabled in MyASUS or the BIOS, which caps charge at 80% to reduce cycle stress on the original cell. Go to MyASUS → Battery Health Charging and switch the mode to Full Capacity Mode, or disable the setting in the BIOS under Advanced → Battery settings. The new cell will then charge to 100%.
The Wh rating shown in Windows (or HWiNFO) is different from the 49.09Wh spec — which is correct?
Windows reads the Wh figure from the cell's EEPROM, which stores the manufacturer's rated design capacity. The 49.09Wh figure in the product data is the actual measured capacity of the new cell. Small differences between EEPROM-reported and real-world Wh values are normal across Li-Polymer cells — the two figures reconcile after two or three full calibration cycles once the fuel gauge IC has mapped the new cell's actual discharge curve.
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