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ASUS ProBook PU401 Replacement Battery 11.1V C31N1303

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From $125.99 USD $152.99
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Fits Asus ProBook PU401, PU401LA, and Essential PU401LA models; replaces OEM part number C31N1303.
This 11.1V, 3950mAh Li-Polymer cell delivers 43.85Wh — matching the original pack capacity for full runtime on the ultrabook platform.
Connector type is the proprietary Asus four-pin press-fit; orientation is fixed by the keyed slot on the mainboard contact edge.
We ran a full charge cycle on a PU401LA unit; the BMS engaged without fault codes and held voltage under sustained keyboard and display load.
After installation, run one full discharge to hibernation cutoff, then charge uninterrupted to 100% — this resets the BIOS battery learn cycle and clears inaccurate health warnings that appear 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.

Discount: As a thank you for your patience, enjoy 5% off on your order
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Fresh Battery, Worth the Wait

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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By continuing with your purchase, you acknowledge and agree to the estimated 7–10 business day delivery timeframe.
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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.

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: 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

11.1V

Amp

3950mAh

Asus AsusPro PU401 Series — 11.1V Li-Polymer Replacement Battery (C31N1303)

This is an 11.1V, 3950mAh (43.85Wh) Li-Polymer replacement battery for the Asus AsusPro PU401 series ultrabook. It fits the PU401LA, AsusPro Essential PU401LA, and PU401LA-XB51, among others. The OEM part numbers it replaces are C31N1303 and 0B200-00470000.

  • PU401 series fit: These models share the same three-cell Li-Polymer battery bay, connector pinout, and BMS handshake protocol. The battery slots into the same physical footprint at 292.50 × 72.34 × 11.18mm with no modification needed.
  • Bench tested on actual hardware: We ran this cell through charge and discharge cycles on a PU401LA. The BMS communicated correctly with the BIOS, reported accurate state-of-charge, and the protection circuit triggered at the expected low-voltage cutoff threshold.
  • First-cycle recalibration on the PU401: After installing, run one full discharge until the laptop hibernates, then charge uninterrupted to 100%. This forces the BIOS battery learn cycle to reset against the new cell and clears the inaccurate health warning that appears after every cell swap on this platform.

Why the PU401 BIOS flags a new battery as poor health

The PU401 stores battery health data in EEPROM on the old cell. When you swap the cell, the BIOS reads no matching EEPROM record and defaults to a poor health or unknown status flag. This is a data mismatch, not a fault with the replacement cell. Running a full discharge-to-hibernate followed by an uninterrupted charge to 100% initiates the learn cycle and writes fresh calibration data to the new cell's EEPROM. After one or two full cycles, the health status normalises.

Laptop shuts down at 20–30% charge shown on the PU401

This happens when the fuel gauge IC is still calibrated to the old cell's discharge curve. The displayed percentage no longer matches actual cell voltage, so the laptop cuts off before the gauge reaches 0%. It is not a fault in the replacement cell — it is a calibration lag. Run two or three full discharge-to-hibernate and full-charge cycles without interruption. By the third cycle the fuel gauge IC re-maps to the new cell's curve and the readings stabilise to within a few percent of actual remaining capacity.

Compatible Models

AsusPro PU401 AsusPro PU401LA AsusPro Essential PU401LA PU401LA-XB51 PU401LA-WO048G PU401LA-WO142G PU401LA-T8279 PU401LA-C8279 PU401LA-WO022G PU401LA -WO097G PU401LA-WO068G PU401LA-WO121G PU401LA-WO183G PU401LA-WO138G PU401LA-WO133G PU401LA-WO136G PU401LA-CZ027G PU401LA-WO095H PU401LA-WO067D PU401LA-WO139D PU401LA-WO156G PU401LA-WO085G PU401LA-WO143G PU401LA-WO075P PU401LA-WO038D PU401LA-WO122H PI401LA-WO110D PU401LA-W0046G PU401LA-WO074P PU401LA-0311A4200U PU401LA-WO227D PU401LA-WO091H PU401LA-0681A4030U PU401LA-XB51-CB PU401E4010LA PU401LA-WO132G PU401LA-WO066D PU401LA-W0136G PU401LA40384DX3 PU401LA-WO073P PU401LA-W0045G PU401LA-0091A4200U PU401E4288LA PU401LA-0601A4210U PU401E4200LA PU401LA-WO130H PU401LA-1A PU401E4500LA PU401L PU401LA PU401

Replaces Part Numbers

C31N1303 0B200-00470000

Technical Specifications

Voltage11.1V
Amp Hours3950mAh
Capacity3950mAh
Rate43.85Wh
Net Weight284.5g /10.04 oz
Gross Weight544.5g /19.21 oz
Approximate Weight544.5g /19.21 oz
Dimension 292.50 x 72.34 x 11.18mm

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 BIOS on my PU401 is showing the new battery as "unknown" or 0% — is the replacement cell faulty?

It is not faulty. The PU401 BIOS reads health data from EEPROM written by the original cell, and a fresh replacement cell carries no matching record. The BIOS flags it as unknown by default. Run one full discharge until the laptop hibernates on its own, then charge uninterrupted to 100% — that single learn cycle writes new EEPROM data and clears the flag.

My PU401 shows 43Wh in Windows battery report but the specs list a different Wh figure — why do they differ?

The Wh figure Windows reads comes from EEPROM data embedded in the original cell's firmware, not from live measurement. A replacement cell ships with its own EEPROM rated value, which may differ slightly from the previous cell's stored figure. The actual usable capacity is 43.85Wh as rated. After two full charge-discharge cycles the OS fuel gauge recalibrates against real cell output and the reported figure settles.

My PU401 battery charge stops at 80% and never goes higher — is the new cell defective?

This is almost always a BIOS charge-limit setting, not a cell fault. Asus notebooks on this platform include a battery health charge mode that caps charging at 80% to reduce cell wear — it is controlled by firmware, not the battery itself. Open Asus Battery Health Charging in Windows (or MyASUS app), switch the mode from "Balanced" or "Maximum Lifespan" to "Full Capacity," and the charge ceiling lifts to 100%.

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