Asus VivoBook Pro 14X OLED C31N2019 Replacement Battery 11.61V
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Asus VivoBook Pro 14X OLED C31N2019 Replacement Battery 11.61V - 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 VivoBook Pro 14X OLED C31N2019 Replacement Battery 11.61V - is backordered and will ship as soon as it is back in stock.
Voltage
11.61V
Amp
5400mAh
Asus VivoBook Pro 14X OLED M7400 — 11.61V Li-Polymer Replacement Battery (C31N2019)
This is an 11.61V, 5400mAh (62.69Wh) lithium-polymer battery for the Asus VivoBook Pro 14X OLED M7400 and compatible VivoBook Pro 15 OLED models. It replaces OEM part number C31N2019. The cell fits the same connector and BMS handshake as the original, so the laptop recognises it without driver changes.
- VivoBook Pro M7400 and M3500QC platform fit: These models share the same 3-cell 11.61V architecture, connector pinout, and BMS communication protocol. One cell design covers the full lineup without modification.
- Bench tested on actual hardware: We cycled this cell through charge and discharge on a VivoBook Pro unit and confirmed the BMS handshake, charge termination at full voltage, and thermal cutoff response all behave as expected with the OEM controller.
- Post-install calibration on the OLED display load: After fitting, run one full discharge to hibernate cutoff, then charge uninterrupted to 100%. The OLED panel draws significantly more power under sustained load than a standard LCD — skipping this step leaves the fuel gauge IC miscalibrated, causing early shutdowns and inaccurate percentage readings.
Laptop shutting down at 20–30% remaining after battery swap
This happens because the fuel gauge IC is still calibrated to the old cell's discharge curve. When the VivoBook Pro draws full load — CPU boost plus the OLED panel at high brightness — the new cell's voltage drops steeply at the lower state-of-charge range. The controller reads that voltage cliff as an imminent cutoff and shuts the system down before the gauge reaches 0%. Run one full discharge to hibernate, then a full uninterrupted charge to 100%, and repeat once more. After two complete cycles, the fuel gauge recalibrates and shutdowns stop occurring above 10%.
BIOS reporting battery health as poor or "unknown" immediately after replacement
The BIOS reads health data from EEPROM registers that the old cell wrote over months of use. A new cell has blank or default EEPROM values, which the firmware interprets as a degraded or unrecognised pack. This is a firmware read issue, not a fault with the replacement cell. To clear it, run the battery learn cycle: discharge fully to hibernate cutoff, then charge uninterrupted to 100%. The BIOS rewrites its health baseline from the new cell's data after one complete cycle and the 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 VivoBook Pro shows the wrong Wh rating in Windows battery report after I put in the new C31N2019 cell — is the battery the wrong capacity?
The Windows battery report pulls the design capacity from the cell's EEPROM, which on a new replacement may show a rated value that differs slightly from the 62.69Wh printed on the label — this is an EEPROM data difference, not a wrong cell. The actual charge delivered matches the physical chemistry of the cell, not the EEPROM figure. Run one full discharge to hibernate cutoff and a full charge to 100% to let the fuel gauge IC write accurate data. After the first complete cycle, the reported Wh figure in the battery report stabilises.
The new battery charges to 80% and then just stops — nothing I do gets it past that point.
The VivoBook Pro BIOS includes a charge limit setting that caps charging at 80% to reduce cell stress during long plugged-in sessions. This is a BIOS-controlled firmware feature, not a fault with the replacement cell. Go to MyASUS app or BIOS power settings and check whether "Battery Health Charging" is enabled and set to Balanced or Full Capacity mode. Switch it to Full Capacity mode and the charge ceiling moves back to 100%.
After the swap, the battery percentage jumps around — it reads 60%, then skips to 35% a few minutes later with no heavy use. What causes that?
The fuel gauge IC uses the old cell's learned discharge curve as its reference, and a new cell has a slightly different internal resistance profile. Until the IC recalibrates, it misreads voltage-to-percentage conversion and the gauge skips in large steps. This is common for the first two to three charge cycles on any C31N2019 replacement. Run two full discharge-to-hibernate, charge-to-100% cycles and the gauge IC locks onto the new cell's curve — percentage readings settle and stop jumping after that.
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