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Asus Zenbook 14 UX433FQ Replacement Battery C31N1831 11.55V

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From $102.99 USD $123.99
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Fits Asus Zenbook 14 UX433FQ-A5105R and Zenbook Flip 13 UX362FA models; replaces OEM C31N1831, 0B200-03330200, 0B200-03630000.
11.55V 4150mAh Li-Polymer cell delivers 47.93Wh; sustains the Zenbook's full CPU and display load without throttling.
Connector slides straight into the internal slot beneath the keyboard deck; locking tab seats flush with the housing frame.
We bench-tested this cell in a UX433FQ motherboard; the BMS accepted the new pack on first power cycle without fault codes.
After installation, run one full discharge to hibernation-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.
Delivery time

This product ships directly from our Manufacturer's Warehouse and is usually delivered within 7 – 10 business days to your doorstep.

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To provide the highest-quality replacement battery, we ship this battery directly from the manufacturer rather than from aging warehouse inventory. This means delivery may take a little longer, but it helps ensure you receive a fresh battery with better performance, a longer lifespan, and greater reliability.

Estimated delivery: 7–10 business days
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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.

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🔹 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: 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.

Voltage

11.55V

Amp

4150mAh

Asus Zenbook 14 UX433FQ / Zenbook Flip 13 UX362FA — 11.55V Li-Polymer Replacement Battery (C31N1831)

This is an 11.55V Li-Polymer replacement battery rated at 4150mAh (47.93Wh), built to the C31N1831 specification. It fits the Asus Zenbook 14 UX433FQ-A5105R, P574FA, Zenbook Flip 13 UX362FA-BP8505T, UX362FA-EL094T, and over 50 additional Asus ultrabook variants sharing the same connector and BMS handshake. It replaces the internal battery when the original cell has degraded or failed.

  • UX433 and UX362 platform compatibility: Both series use the same 3-cell Li-Polymer configuration on the 11.55V rail, the same physical connector, and the same EEPROM-based BMS communication. That shared architecture is why one part number covers both chassis lines.
  • Bench tested on actual hardware: We ran this cell on a UX433 chassis. The BMS handshake completed on first boot, charge negotiation initialized correctly, and the SMBus reported accurate cell voltage throughout the cycle. No trip events during charge or under CPU and display load.
  • Post-installation learn cycle on Asus ultrabooks: After fitting this battery, discharge the laptop fully until it hibernates, then charge uninterrupted to 100% without interruption. This resets the BIOS battery learn cycle and clears the inaccurate health warning that appears in MyASUS or Windows after any cell swap.

BIOS reporting poor battery health immediately after fitting the C31N1831

The BIOS and MyASUS app read health data from EEPROM registers in the battery's BMS, not directly from cell voltage. When a new cell is installed, those registers haven't been written by a complete charge-discharge cycle on this chassis, so the system reports stale or null data as "poor health." Run one full discharge to hibernate cutoff, then a full uninterrupted charge to 100%. After that cycle, the BIOS rewrites the health registers against real measured data and the warning clears.

Laptop shuts down while battery gauge still shows 15–25% remaining

This is a voltage cliff, not a capacity fault. Under combined CPU turbo and display load, cell voltage drops faster than the fuel gauge IC can recalculate the state-of-charge curve. The BMS trips the output when voltage falls below the protection threshold — typically around 9.0V at the pack — even though the displayed percentage hasn't reached zero. The fuel gauge IC needs two to three full calibration cycles against the new cell before its discharge curve maps accurately. Run full discharge-to-hibernate then full charge cycles and the cutoff point will shift down to the correct low-percentage range.

Compatible Models

Zenbook 14 UX433FQ-A5105R P574FA Zenbook Flip 13 UX362FA-BP8505T ZenBook Flip 13 UX362FA-EL094T P3540FA-BQ0079R ZenBook Flip 13 UX362FA-EL308T ZenBook UX430UQ-GV235R ZenBook 14 UX433FQ-A5032T P3548FA Zenbook Flip 13 UX362FA-BP8203T ZenBook Flip 13 UX362FA-EL128T p3540fa-0101a8565u ZenBook Flip 13 UX362FA-EL148T ZenBook 14 UX433FA-A5232R ZenBook 14 UX433FQ-A5033R Pro574FA ZenBook Flip 13 UX362FA-EL226T ZenBook Flip 13 UX362FA-EL254T Zenbook 14 UX433FN-A5802T p3540fa-ej00056r ZenBook Flip 13 UX362FA-EL701T P3540FA-BQ0067R ZenBook Flip 13 UX362FA-EL205T ZenBook UX430UA-GV445T Zenbook 14 UX433FQ-A5032R PE574FA ZenBook Flip 13 UX362FA-EL046T Zenbook Flip 13 UX362FA-EL090T P3540FA-BQ0034 ZenBook Flip 13 UX362FA-EL205R Zenbook UX430UQ-GV045T Zenbook 14 UX433FQ-A5107R P3540FA ZenBook Flip 13 UX362FA-EL206T ZenBook Flip 13 UX362FA-EL225R p3540fa-0091a8265u ZenBook Flip 13 UX362FA-EL098T ZenBook 14 UX434FQ-AI116T Zenbook 14 UX433FQ-AI109T Pro3548FA ZenBook Flip 13 UX362FA-EL501T Zenbook Flip13 UX362FA-EL969T p3540fa-ej0056r ZenBook Flip 13-UX362FA-EL217T ZenBook 14 UX433FA-A6168R ZenBook 14 UX433FQ-A5081T P3540FA-BR0142R ZenBook Flip 13 UX362FA-EL221T ZenBook UX430UA-GV569T Zenbook 14 UX433FN-N5230R PX574FA p3540fa-ej0058r ZenBook Flip 13 UX362FA-EL224T P3540FA-BQ0072R Zenbook FLIP 13 UX362FA-EL277T Zenbook UX430UQ-GV082T

Replaces Part Numbers

C31N1831 0B200-03330200 0B200-03630000

Technical Specifications

Voltage11.55V
Amp Hours4150mAh
Capacity4150mAh
Rate47.93Wh
Net Weight242.2g /8.54 oz
Gross Weight502.2g /17.71 oz
Approximate Weight502.2g /17.71 oz
Dimension 284.34 x 93.30 x 7.45mm

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 shows the new battery as 0% health or "unknown" right after installation — is the cell faulty?

It isn't a faulty cell. The MyASUS health reading pulls from EEPROM data written by the battery's BMS during completed charge-discharge cycles — a brand-new cell has no history logged yet, so the system reports null data as 0% or unknown. Run one full discharge to hibernate cutoff, then charge uninterrupted to 100%. After that single learn cycle, the BIOS rewrites the health registers and the correct reading appears.

Windows battery report shows the C31N1831 replacement at a different Wh rating than the original — why don't the numbers match?

Windows pulls the Wh figure from the battery's EEPROM, which stores the manufacturer-rated design capacity. The replacement cell is rated at 47.93Wh; if the original had logged a different value due to degradation or a variant SKU, the numbers won't match at first. This is an EEPROM data difference, not a wiring or compatibility problem. After one full calibration cycle the reported figure stabilises against the actual measured capacity of the new cell.

The replacement battery stops charging at 80% and won't go higher — is the new cell defective?

Almost certainly not. Asus Zenbook firmware includes a BIOS-controlled charge limit feature — sometimes called Battery Health Charging — that caps charging at 80% to reduce long-term cell stress. Check the MyASUS app or BIOS power settings under Battery Health Charging and switch the mode to Full Capacity. Once that setting is changed, the charge limit is lifted and the battery will charge to 100%.

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