Asus ZenBook 14 UM425IA Replacement Battery C41N1904 15.48V
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Asus ZenBook 14 UM425IA Replacement Battery C41N1904 15.48V - 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
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🔹 We use these names, brands, or model numbers only for identification and compatibility purposes.
Asus ZenBook 14 UM425IA Replacement Battery C41N1904 15.48V - is backordered and will ship as soon as it is back in stock.
Voltage
15.48V
Amp
4250mAh
Asus ZenBook 14 UM425IA / ZenBook 13 UX325JA — 15.48V Li-Polymer Replacement Battery (C41N1904)
This is a 15.48V, 4250mAh (65.79Wh) Li-Polymer battery for the Asus ZenBook 14 UM425IA-R5DRDSB1, ZenBook 13 UX325JA series, X435EA, and over 157 additional ZenBook variants. The OEM part number is C41N1904, also cross-referenced as 02B200-03660500, 0B200-03660000, and C41N1904-1. If the original cell no longer holds charge under load, this is a direct cell-for-cell swap at the same voltage and form factor.
- ZenBook 14 UM425IA and UX325JA platform compatibility: These models share the same 15.48V four-cell architecture, identical connector pinout, and the same BMS handshake protocol — which is why a single part number covers both the UM425IA and UX325JA lines without modification.
- Bench tested on actual hardware: We ran this cell through charge and discharge cycles on ZenBook-class hardware. The BMS negotiated correctly with the BIOS on first boot, reported the expected Wh figure in system info, and charge current tapered cleanly at full capacity without triggering any protection cutoff.
- Post-install calibration on ZenBook BIOS: After fitting this cell, run a full discharge until the laptop hibernates, then charge uninterrupted to 100% without interruption. This resets the BIOS battery learn cycle and clears the inaccurate health warning that typically appears after every cell swap on this platform.
Why ZenBook BIOS reports poor battery health immediately after a new cell swap
The ZenBook BIOS reads health data from an EEPROM register that carries over state-of-health figures from the old cell. A new cell physically installed does not automatically reset that register — the BIOS simply reads the last-known degraded value and flags it as poor. This is not a fault with the replacement cell. One full discharge-to-hibernate followed by an uninterrupted charge to 100% forces the fuel gauge IC to rewrite its baseline against the new cell's actual chemistry. After that cycle completes, the health warning clears and the reported capacity aligns with the rated 65.79Wh.
ZenBook shuts down at 20–30% remaining after battery swap
This happens when the fuel gauge IC has not yet calibrated against the new cell's discharge curve. Under combined CPU and display load, voltage drops faster than the old curve predicts — the BIOS hits its low-voltage cutoff while the gauge still shows 20–30% remaining. The cell is not faulty; the gauge is reading from a stale profile. Run two full discharge-to-hibernate cycles followed by uninterrupted charges to 100%, and the fuel gauge IC will rebuild an accurate curve against the new cell, eliminating the premature shutdown.
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 shows the new battery as 0% and won't charge — is this a dead cell?
This is almost always the BIOS failing to recognise the new cell's EEPROM data on first boot, not a dead cell. Shut the laptop down completely, hold the power button for 10 seconds to clear residual charge from the board, then boot and plug in the charger. If the charge indicator still shows 0% after 15 minutes, enter the BIOS and check whether the battery is listed under the power settings — if it appears there, the cell is communicating and the OS fuel gauge simply needs a calibration cycle to rebase against 15.48V.
Why does Windows report this battery as 62Wh when the spec says 65.79Wh?
The figure Windows pulls comes from the EEPROM on the cell, which stores a rated design capacity that can differ slightly from the actual measured chemistry of a new cell. This is a data register difference, not a capacity shortfall — the cell physically holds the full 65.79Wh. After one complete discharge-to-hibernate and a full uninterrupted recharge to 100%, the fuel gauge IC recalculates from measured data and the reported Wh figure in Windows Battery Report will move closer to the rated value.
The ZenBook battery stops charging at exactly 80% and won't go higher — what's causing that?
The UM425IA and UX325JA lines have a BIOS-level charge limit setting that caps charging at 80% when Battery Care Mode is active — this is a firmware control, not a battery fault. Open MyASUS or the ASUS Battery Health Charging utility, and switch from Balanced or Maximum Lifespan mode to Full Capacity mode. Once switched, plug the charger back in and the cell will charge to 100%. If the utility is not installed, the same toggle is accessible under Advanced Power Settings in the BIOS.
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