Asus U30JC Replacement Battery 14.8V 6600mAh A31-UL30
Available by SPECIAL ORDER. Delivery for this product typically takes 2 weeks.
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Asus U30JC Replacement Battery 14.8V 6600mAh A31-UL30 - 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 U30JC Replacement Battery 14.8V 6600mAh A31-UL30 - is backordered and will ship as soon as it is back in stock.
Voltage
14.8V
Amp
6600mAh
Asus U30JC / U35 / U45 Series — 14.8V Li-ion Replacement Battery (A32-UL30 / A42-UL80)
This 14.8V, 6600mAh (97.68Wh) Li-ion battery replaces the original cell in Asus U30JC, U35, U35JC, U45, and related UL-series laptops. It matches the OEM voltage rail and connector pinout for the affected models. Install it when the original battery no longer holds a usable charge during unplugged use.
- U30 / U35 / U45 platform compatibility: These models share a common battery bay form factor, 14.8V nominal rail, and the same four-pin BMS connector. The UL30, UL50, and UL80 sub-variants use identical BMS handshake logic, so one cell covers all of them without adapter or modification.
- Bench tested on actual hardware: We ran this cell on a U35JC unit and cycled it through full charge and discharge sequences. The BMS negotiated correctly with the BIOS on first insertion, and the charge circuit accepted the new cell without a BMS trip or error flag.
- Post-swap calibration on UL-series hardware: After fitting this battery, run a full discharge until the laptop hibernates at cutoff, then charge uninterrupted to 100% without interruption. This forces the BIOS battery learn cycle to recalibrate against the new cell and clears the false "poor health" or "0% capacity" flag that UL-series BIOS versions commonly report after every cell swap.
BIOS reporting poor battery health immediately after fitting a new cell
Asus UL-series laptops store battery health data in EEPROM on the BMS board. When a new cell is installed, the BIOS reads stale EEPROM data from the old battery's last recorded state and flags the replacement as degraded or unknown. This is a firmware read issue, not a fault with the new battery. Run one complete discharge-to-hibernate cycle followed by an uninterrupted full charge to allow the BIOS learn cycle to overwrite the old EEPROM values. After two full cycles, the health indicator should read accurately.
Laptop shuts down abruptly at 20–30% charge shown on screen
This happens when the fuel gauge IC has not yet calibrated to the new cell's discharge curve. The IC predicts cutoff using the old cell's voltage-to-capacity mapping, and the new cell hits a steeper voltage cliff at lower states of charge than the old worn cell did. The laptop interprets this voltage drop as an emergency cutoff before the displayed percentage reaches zero. Complete two full discharge-to-hibernate and charge-to-100% cycles without interruption — after that, the fuel gauge IC recalibrates and the shutdowns stop. The target charge floor before each hibernate trigger is the BIOS low-battery cutoff, typically around 10.5V under load.
Compatible Models
Replaces Part Numbers
Technical Specifications
Product Highlights
- Brand: Asus
- Manufacturer: CS
- Series: Standard
- Color: Black
- Product Type: Li-ion
- Battery Type: Li-ion
- Warranty: 12 Months
- Bulk Orders: sales@batteryweb.com
Frequently Asked Questions
The Asus BIOS shows "0% available (plugged in, charging)" and never moves — is the new battery faulty?
This is an EEPROM data mismatch, not a dead cell. The BIOS read the health record from the old battery's chip and is applying it to the new cell. Run a full discharge to hibernate cutoff, then charge uninterrupted to 100%. That forces the BIOS learn cycle to write fresh data against the new cell. After one complete cycle the percentage should update normally.
Windows is reporting the battery capacity as roughly half the rated Wh — the System Information panel shows around 48Wh instead of 97Wh.
The Windows power report pulls the Wh figure from the EEPROM rated value stored on the BMS, not from a live measurement of the actual cells. A freshly installed cell with uncalibrated EEPROM will often report a mismatched or stale design capacity. Complete two full discharge-and-recharge cycles so the fuel gauge IC can record actual cell data. After calibration, the reported Wh figure in the battery report should align with the 97.68Wh rating of this cell.
The charge stops at 80% and the indicator light goes green as if charging is complete — the laptop never reaches 100%.
Some Asus UL-series BIOS versions ship with a charge-limit feature active by default, capping charge at 80% to reduce cell stress during long periods on AC power. Check the Asus Power4Gear or MyASUS application — there is a battery charge limit toggle under the battery health section. Disable the charge limit or set the threshold to 100%, then reconnect the charger. The charge circuit will resume and bring the cell to a full 14.8V terminal voltage.
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