Asus A2 A42-A2 Replacement Battery 14.8V 4400mAh Li-ion
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Asus A2 A42-A2 Replacement Battery 14.8V 4400mAh Li-ion - 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 A2 A42-A2 Replacement Battery 14.8V 4400mAh Li-ion - is backordered and will ship as soon as it is back in stock.
Voltage
14.8V
Amp
4400mAh
Asus A2 / A2000 Series — 14.8V Li-ion Replacement Battery (A42-A2)
This is a 14.8V, 4400mAh (65.12Wh) Li-ion battery for the Asus A2 and A2000 series notebooks. It replaces OEM part numbers A42-A2, 90-N7V1B1000, 90-N7V1B1200, and 70-N7V1B3000. If your original pack won't hold a charge or the laptop dies unplugged, this is the direct cell replacement.
- A2 and A2000 series compatibility: The A2, A2000C, A2000D, and 24 additional A2000 variants all run the same 14.8V four-cell Li-ion architecture with an identical connector and BMS handshake — one part number covers the entire platform.
- Bench tested on actual hardware: We ran this cell on an A2000 unit and cycled it through full charge and discharge. The BMS responded correctly at both ends — charge termination triggered at 16.8V and low-voltage cutoff held at 11.0V without fault codes.
- First-cycle reset after install: After fitting this cell, run one full discharge to hibernate cutoff, 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 A2-series boards.
Why the A2000 BIOS flags a new battery as poor health immediately after swap
The A2000 BIOS stores historical charge data in EEPROM on the old battery pack. When a new cell arrives, the BIOS has no learned data for it and defaults to a poor or unknown health status. This is not a battery fault — it is a calibration state. Running one full discharge-to-hibernate followed by an uninterrupted charge to 100% writes fresh data to the BIOS learn table. After two to three full cycles, the health indicator normalises.
Laptop shuts down at 20–30% charge shown on A2 series
This happens when the cell voltage drops below the sustainable threshold under combined CPU and display load before the fuel gauge reaches zero. The old cell's discharge curve is still programmed into the fuel gauge IC, so it reads 25% while the actual cell voltage has already hit the cutoff cliff. The fix is a full calibration cycle — discharge fully until the laptop hibernates on its own, then charge to 100% without interruption. After two cycles the fuel gauge IC recalibrates against the new cell's actual voltage curve and the early shutdowns stop.
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 A2000 shows 0% and "plugged in, not charging" right after I installed the new battery — is the cell dead?
It is almost never a dead cell. The A2000 fuel gauge IC has no data for the new cell and defaults to 0% until it completes a calibration cycle. Plug in the AC adapter and leave it connected for a full uninterrupted charge to 100%, then discharge fully to hibernate cutoff. After that first complete cycle the charge reading stabilises. If the laptop still shows 0% after two full cycles, check the charge port and adapter output — target 19V DC at the barrel connector.
Windows is reporting the wrong Wh rating for this battery — it says 48Wh but the cell is rated 65.12Wh. What is going on?
The Wh figure Windows displays is pulled from EEPROM data written to the pack at manufacture, and older A2-series boards sometimes read the rated cell chemistry value rather than the actual pack spec. This is a data mismatch between the BIOS battery table and the new cell's EEPROM — it does not affect how much charge the battery actually stores or delivers. Run two full discharge-and-charge calibration cycles and check whether the reported figure updates. If it does not, the BIOS on this board revision reads a fixed legacy value and the display is cosmetic only.
My A2000 fuel gauge jumps erratically — goes from 60% to 85% then back to 40% within minutes. How do I fix it?
The fuel gauge IC on A2-series boards tracks capacity by integrating current over time against a stored discharge curve. When the old curve does not match the new cell's chemistry, the IC overcorrects repeatedly, causing the erratic percentage jumps you are seeing. This is a calibration problem, not a wiring or cell fault. Discharge the laptop fully until it hibernates on its own, then charge uninterrupted to 100% — repeat this cycle three times and the gauge IC will lock onto the correct curve for the new cell.
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