Asus ZenBook 14X OLED Replacement Battery 11.61V 5400mAh
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Asus ZenBook 14X OLED Replacement Battery 11.61V 5400mAh - 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.
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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 14X OLED Replacement Battery 11.61V 5400mAh - is backordered and will ship as soon as it is back in stock.
Voltage
11.61V
Amp
5400mAh
Asus ZenBook 14X OLED UX5401EA Series — 11.61V Li-Polymer Replacement Battery (C31N2021)
This 11.61V, 5400mAh (62.69Wh) lithium-polymer battery replaces the original cell in the Asus ZenBook 14X OLED UX5401EA-KN511TS and a wide range of ZenBook 14X and ZenBook 14 Flip OLED models. It matches OEM part numbers C31N2021 and 0B200-04030000. The cell fits the 14-inch OLED ultrabook chassis and connects through the original three-cell series configuration.
- ZenBook 14X and 14 Flip OLED platform fit: The UX5401EA and UN5401QA share the same 11.61V three-cell architecture, connector pinout, and BMS handshake protocol — which is why a single cell covers both the clamshell and the 360-degree flip variants without modification.
- Bench tested on actual hardware: We ran this cell through charge and discharge cycles on ZenBook 14X hardware. The BMS negotiated correctly with the EC firmware, current draw during OLED-on CPU stress registered within spec, and the protection circuit responded to both overcharge and over-discharge cutoff thresholds as expected.
- Post-swap battery learn cycle on ZenBook BIOS: After installing, run the laptop down to hibernate cutoff on battery only — no AC — then charge uninterrupted to 100%. This forces the embedded controller to relearn the new cell's capacity curve and clears the inaccurate health warning that appears in MyASUS after every cell replacement.
Why BIOS reports poor battery health immediately after fitting a new cell
The ZenBook's embedded controller reads health data from the battery's EEPROM — a small memory chip that stores cycle count, rated Wh, and state-of-health flags written by the original cell during manufacture. When a replacement cell arrives, those EEPROM values don't match what the EC recorded for the old pack, so it flags the battery as degraded before a single charge cycle has run. Running the full discharge-to-hibernate then uninterrupted charge sequence rewrites the learned capacity data and clears the false warning. Until that cycle completes, the health percentage shown in BIOS and MyASUS is not a reliable indicator of the new cell's condition.
ZenBook shutting down at 20–30% charge shown on screen
This happens when the cell voltage collapses under combined CPU and OLED panel load before the fuel gauge IC expects it to — the display is showing a percentage derived from the old cell's discharge curve, not the new one. The voltage cliff hits earlier than the gauge predicts, and the EC shuts the system down to protect the cell. It is not a fault with the replacement battery. Two to three full calibration cycles — full discharge to hibernate, full charge to 100% each time — allow the fuel gauge IC to map the new cell's actual voltage-to-capacity curve and bring the shutdown point back in line with the displayed percentage.
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
MyASUS says battery health is 0% or "unknown" right after I put in the new cell — is something wrong with it?
Nothing is wrong with the cell. The MyASUS health reading pulls from EEPROM data written by the original battery, and the replacement cell carries different values that the EC hasn't reconciled yet. Run one full discharge to hibernate cutoff on battery only, then charge uninterrupted to 100% without interruption. After that learn cycle completes, the health reading will update to reflect the actual condition of the new cell.
The battery percentage shown in Windows is jumping around — it goes from 45% to 12% in a few minutes after the swap.
The fuel gauge IC is still using the discharge curve it mapped for the old cell. Against a new cell with different internal resistance, those estimates are off until the IC recalibrates. Run two to three complete cycles — drain to hibernate cutoff, charge straight to 100% each time — and the gauge will re-map the curve. After the third cycle, readings stabilise and the percentage tracks actual capacity correctly.
Windows shows 62Wh but BIOS shows a different Wh figure — which one is right?
The BIOS figure comes from the rated Wh stored in the battery EEPROM at the factory; the 62.69Wh in Windows is what the fuel gauge IC measures from actual cell chemistry under load. These two numbers differ on replacement cells because the EEPROM value is set by the OEM and doesn't update after a swap. The Windows figure is the one to trust for real-world capacity. No action is needed — the discrepancy is informational only and does not affect charging or operation.
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