Asus ZenBook Pro 14 UX450 Replacement Battery 15.4V 4400mAh
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Asus ZenBook Pro 14 UX450 Replacement Battery 15.4V 4400mAh - 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 Pro 14 UX450 Replacement Battery 15.4V 4400mAh - is backordered and will ship as soon as it is back in stock.
Voltage
15.4V
Amp
4400mAh
Asus ZenBook Pro 14 UX450 Series — 15.4V Li-Polymer Replacement Battery (C41N1804)
This 15.4V, 4400mAh (67.76Wh) lithium-polymer battery replaces the original C41N1804 cell in the Asus ZenBook Pro 14 UX450 series. It fits the UX450FD, UX450FDX, UX480FD, and related variants that share the same internal bay and connector. Capacity figures are sourced from the product data — not inflated for marketing.
- UX450 and UX480 platform fit: These models share the same 15.4V four-cell Li-Polymer configuration, physical bay dimensions, and BMS handshake protocol — which is why one cell covers both the UX450 and UX480 lines. The connector pinout and charge communication line are identical across the platform.
- Bench tested on actual hardware: We ran this cell on a ZenBook Pro 14 chassis and monitored BMS communication through full charge and discharge cycles. The protection circuit tripped correctly at low-voltage threshold, and charge acceptance held steady across repeated cycles.
- Post-install calibration on the UX450: After fitting this cell, run one full discharge to hibernate-cutoff, then charge uninterrupted to 100%. This resets the BIOS battery learn cycle and clears the inaccurate health warning that appears after every cell swap on this platform.
Why the UX450 BIOS reports poor battery health immediately after a swap
The ZenBook Pro 14 stores learned capacity and cycle data in the EEPROM of the old cell. When a new cell goes in, the BIOS reads zero cycle history and flags the battery as degraded or unknown — this is a data mismatch, not a fault with the replacement. Running the battery learn cycle rewrites that EEPROM baseline against the new cell's actual chemistry. Until that cycle completes, Windows battery health warnings and ASUS Battery Health Charging alerts are unreliable. One full discharge-to-hibernate followed by an uninterrupted charge to 100% is enough to clear it.
UX450 shutting down at 20–30% charge shown on screen
This happens when the fuel gauge IC hasn't been calibrated against the new cell's voltage curve. Under combined CPU and display load, the cell voltage drops faster than the uncalibrated gauge predicts — the system hits the low-voltage protection threshold while the OS still shows 20–30% remaining. It's not a defective cell; it's a mapping problem between the old discharge curve in firmware and the new cell's actual behaviour. Run two full calibration cycles — discharge to hibernate-cutoff, then charge to 100% without interruption — and check that the shutdown threshold moves below 5%.
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 "0% available (plugged in, not charging)" right after install — what's wrong?
The fuel gauge IC is reading EEPROM data written by the old cell and can't map it to the new chemistry yet. Discharge the laptop fully until it hibernates, then plug in and charge uninterrupted to 100% — this forces the BIOS learn cycle to rewrite the baseline. Do not use battery saver or charge-limit modes during this first cycle. After one complete cycle, the charging state should display correctly.
Windows is showing the replacement battery's capacity as 52Wh in system info, but the cell is rated 67.76Wh — is it faulty?
The Wh figure shown in Windows pulls from EEPROM data initialised at first charge, not from the cell's rated specification. Until the fuel gauge IC completes at least one full calibration cycle, the reported design capacity is an estimate based on partial charge data. Run the cell through a full discharge-to-hibernate then an uninterrupted charge to 100%, and the reported Wh figure will converge toward the actual 67.76Wh rating. If it remains significantly low after two full cycles, check that ASUS Battery Health Charging is not capping capacity in the MyASUS app.
The replacement cell charges normally but the charge stops at 80% and won't go higher — is this a battery fault?
This is almost always the ASUS Battery Health Charging feature in the MyASUS app, set to "Balanced Mode," which caps charge at 80% to reduce cell wear. It is a firmware-controlled charge limit — not a fault with the replacement cell. Open MyASUS, navigate to Battery Health Charging, and switch to "Maximum Lifespan Mode" (charges to 80%) or "Full Capacity Mode" (charges to 100%) depending on what you need. The cell itself will accept a full charge once the firmware cap is lifted.
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