ASUS G551 Replacement Battery 10.8V 4800mAh A32N1405
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ASUS G551 Replacement Battery 10.8V 4800mAh A32N1405 - 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 G551 Replacement Battery 10.8V 4800mAh A32N1405 - is backordered and will ship as soon as it is back in stock.
Voltage
10.8V
Amp
4800mAh
Asus G551 Series — 10.8V Li-ion Replacement Battery (A32N1405)
This is a 10.8V, 4800mAh (51.84Wh) Li-ion battery for the Asus G551 gaming laptop series, including the G551J, G551JK, and G551JM. It uses OEM part number A32N1405 and shares the same connector, cell count, and BMS handshake as the original. Install it when the factory cell no longer holds a usable charge under gaming or full CPU load.
- G551 series fitment: The G551J, G551JK, and G551JM all run the same 10.8V three-cell Li-ion rail with an identical connector and EEPROM handshake. One battery fits the full lineup because Asus standardised the BMS protocol across these variants during the G551 production run.
- Bench tested on actual hardware: We ran this cell through charge and discharge cycles on G551JM hardware. The BMS handshake completed correctly, the EEPROM reported accurate Wh data to the OS, and the protection circuit tripped cleanly at the low-voltage cutoff threshold without a hard shutdown.
- Post-install calibration on G551: After fitting, run one full discharge to the hibernate cutoff — do not interrupt it — then charge uninterrupted to 100%. This resets the BIOS battery learn cycle and clears the inaccurate health warning that appears on the status bar after every cell swap on G551 hardware.
BIOS reporting poor battery health immediately after fitting a new G551 cell
The G551 BIOS reads health status from EEPROM data written by the previous cell. When a new battery goes in, the BIOS compares its stored discharge history against the new cell's reported state and flags a mismatch as poor health. This is not a fault with the replacement cell — it is stale data from the old pack. Running one full discharge-to-hibernate followed by an uninterrupted charge to 100% rewrites the learn cycle. After two to three of these cycles, the BIOS health indicator updates to reflect actual cell condition.
G551 shutting down at 20–30% remaining under gaming load
Under combined GPU and CPU load, the G551 draws sharp current spikes that push cell voltage below the BMS cutoff threshold faster than the fuel gauge IC can update the percentage shown on screen. The displayed percentage lags actual cell voltage, so the laptop cuts out while the OS still reports charge remaining. This is a voltage cliff — the cell cannot sustain output voltage at high draw rates once capacity dips past a certain point. Confirm the issue by checking battery voltage under load with HWiNFO64; if pack voltage drops below 9.5V during a stress test, the cell is hitting its discharge floor early and the replacement cell resolves it.
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
My G551 shows 0% or "unknown" battery in Windows immediately after fitting the new cell — what's wrong?
The fuel gauge IC in the G551 still holds EEPROM data from the old pack, and Windows reads that stale state before the new cell has completed a learn cycle. This is not a hardware fault. Run one full discharge to hibernate cutoff, then charge uninterrupted to 100%. After two full cycles, the fuel gauge IC recalibrates against the new cell and Windows reports the correct percentage.
Windows battery status shows 51Wh but the system info panel is displaying a different Wh rating — is the cell wrong?
The Wh figure shown in system info is pulled from EEPROM data stored on the cell's BMS chip. A32N1405 cells occasionally carry a rated-chemistry Wh value that differs slightly from the actual 51.84Wh capacity of the installed cell. This is an EEPROM reporting difference, not a capacity defect. Run the battery learn cycle — one full discharge to hibernate, then a full uninterrupted charge — and the reported Wh value will align with the actual cell spec.
The G551 battery stops charging at 80% and won't go higher — is the replacement cell faulty?
Almost certainly not. Asus G551 firmware includes a BIOS-controlled charge limit that caps charging at 80% when Battery Health Charging mode is enabled. Check the Asus Battery Health Charging utility or the MyASUS app under Power & Sleep settings. Set the charge limit to Full Capacity mode and the cell will charge to 100%. This setting persists across reboots, so confirm it is set correctly before assuming a cell fault.
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