Asus ZenBook 14 UX434FL Compatible Battery C31N1841 11.55V 4200mAh
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Asus ZenBook 14 UX434FL Compatible Battery C31N1841 11.55V 4200mAh - 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 UX434FL Compatible Battery C31N1841 11.55V 4200mAh - is backordered and will ship as soon as it is back in stock.
Voltage
11.55V
Amp
4200mAh
Asus ZenBook 14 UX434FL Series — 11.55V Li-Polymer Replacement Battery (C31N1841)
This is a 11.55V, 4200mAh (48.51Wh) Li-Polymer replacement battery for the Asus ZenBook 14 UX434FL-AI034R and a wide range of UX434 and UX463 variants. It uses OEM part numbers C31N1841 and 0B200-03420200. The battery fits the slim chassis of the UX434 series without modification to connector, orientation, or cell thickness.
- UX434 and UX463 platform compatibility: These models share the same 3-cell Li-Polymer architecture, 11.55V voltage rail, and ZIF connector pinout. The BMS handshake protocol is identical across UX434FL, UX434FLC, and UX463FA variants, so one cell works across the full cluster.
- Bench tested on actual hardware: We ran this cell through a full charge-discharge cycle on a UX434FL unit. The BMS accepted the cell without error codes, charge current stepped down correctly at the 4.2V-per-cell threshold, and the protection circuit tripped cleanly at the low-voltage cutoff.
- Post-install calibration cycle: After fitting this cell, run the laptop down to hibernate cutoff on battery only — no AC during discharge — then charge uninterrupted to 100%. This resets the BIOS battery learn cycle and clears the inaccurate health warning that appears after every cell swap.
Why the ZenBook 14 shuts down at 20–30% after a battery swap
The BIOS fuel gauge IC maps voltage curves from the previous cell's EEPROM data. A new cell has different internal resistance and a slightly different discharge curve, so the gauge misreads the remaining capacity. Under full CPU and display load, the new cell hits a voltage cliff the old EEPROM data didn't predict, and the system cuts power before the indicator reaches zero. Running one full calibration cycle — discharge to hibernate, then a full uninterrupted charge — rewrites the gauge mapping to match the new cell's actual curve.
BIOS reporting battery health as "poor" or "replace" immediately after fitting
This is an EEPROM mismatch, not a fault with the new cell. The BIOS reads health data stored in the old cell's embedded controller and compares it against the new cell's reported Wh value — the figures don't match, so it flags a warning. The fix is a single battery learn cycle: boot into Windows, disconnect AC, let the laptop discharge fully to auto-hibernate, then plug in and charge to 100% without interruption. After one complete cycle, the BIOS recalibrates and the health warning clears.
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 shuts off at around 25% battery after fitting the new cell — is the battery faulty?
The new cell is not faulty. The BIOS fuel gauge IC is still running voltage-to-capacity calculations based on your old cell's EEPROM data, so it misjudges the discharge curve under CPU and display load. Run one full calibration cycle: drain the laptop to hibernate on battery only, then charge uninterrupted to 100%. After that cycle, the gauge recalculates against the new cell and the early cutoff stops.
Windows is showing the Wh rating as lower than the 48.51Wh listed — why does the system info look wrong?
The Wh figure Windows reports is pulled from the cell's EEPROM, which stores the manufacturer-rated capacity of the original battery. The new cell's EEPROM carries its own rated value, and the two numbers don't always match exactly due to chemistry batch differences. This is a reporting discrepancy, not a capacity loss. Run a full discharge-to-hibernate then a 100% charge cycle — the fuel gauge IC recalculates against actual measured charge and the displayed Wh figure corrects itself.
The replacement battery stops charging at 80% and won't go higher — is something wrong with the cell?
This is almost always a BIOS-controlled charge limit, not a problem with the cell itself. Asus firmware on many ZenBook models includes a battery health charging mode that caps charge at 80% to reduce cell stress during long periods on AC power. Check MyASUS or ASUS Battery Health Charging in Windows — if the feature is enabled, switch the mode to "Full Capacity Mode" and the charge ceiling lifts back to 100%.
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