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Asus A42N1403 ROG G751J Replacement Battery 15V 5200mAh

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From $112.99 USD $135.99
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Fits Asus ROG G751J, G751JM, and GFX71JY models; replaces A42N1403, A42LM93, A42LM9H, 0B110-00290000M battery packs.
15V 5200mAh Li-ion cell delivers 78Wh total; voltage and capacity match OEM spec for full CPU and GPU load without thermal throttle.
Connector seats into the right-side battery slot with the locking tab facing outboard; no force required on insertion or removal.
We cycled this cell on the G751J platform and confirmed the BMS completed full charge acceptance within two cycles; no early cutoff.
After installation, run one full discharge to hibernate-cutoff then charge uninterrupted to 100% — this resets the BIOS battery learn cycle and clears false health warnings.
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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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⚠️ 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

15V

Amp

5200mAh

Asus ROG G751J Series — 15V Li-ion Replacement Battery (A42N1403)

This is a 15V Li-ion battery rated at 5200mAh (78Wh), replacing part number A42N1403 in Asus ROG G751J series gaming laptops. It fits the G751J, G751JM, ROG GFX71JY, G751J-BHI7T25, and over 30 additional variants. Install it when the original cell no longer sustains a charge under gaming or CPU-heavy load.

  • G751J platform compatibility: The G751 series shares a four-cell 15V architecture across its variants. The A42N1403 connector, BMS handshake, and voltage rail are consistent across G751J, G751JM, and GFX71JY boards — one cell fits all listed models without adapter or modification.
  • Bench tested on actual hardware: We ran this cell on a G751JM and confirmed the BMS completed a full charge cycle without tripping overcurrent cutoff. Charge acceptance was stable from 0V recovery through to 16.8V termination voltage.
  • Post-install calibration on the G751J: After fitting, discharge the laptop fully 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 this platform.

Why the G751J BIOS reports poor battery health immediately after a cell swap

The G751J stores charge history and wear data in EEPROM on the battery pack itself. When a new cell is installed, the BIOS reads that EEPROM data as blank or mismatched and flags the battery as degraded. This is a data mismatch, not a fault with the replacement cell. Running one full discharge-to-hibernate then a clean uninterrupted charge to 100% rewrites the learn cycle data and resolves the warning. After two or three full cycles, BIOS-reported health should stabilise at normal levels.

Laptop shuts down at 20–30% shown on the Windows gauge

This happens when the fuel gauge IC has not yet calibrated against the new cell's actual discharge curve. The IC is still using the old cell's voltage-to-capacity mapping, so it misreads the cutoff point. Under full GPU and CPU load, the cell hits its minimum sustain voltage before the gauge reaches 0%. Run two full discharge cycles — discharge to hibernate-cutoff, then charge fully to 100% each time — and the fuel gauge IC will recalibrate its endpoint to the correct voltage floor of approximately 12V for this 15V cell.

Compatible Models

G751J G751JM ROG GFX71JY G751J-BHI7T25 GFX71JY4710 G751JL-BSi7T28 ROG G751JY-T7016H ROG G751JM-T7061H ROG G751JY-T7059H ROG G751JT-DH72-CA ROG GFX71JM ROG G751JY-T7163H ROG G751JM-T7041H ROG G751JT-QH72-CB GFX71J ROG GFX71JT GFX71JY4720 ROG G751JT-T7181T ROG G751JY-T7188H ROG G751JL-T7003H GFX71JM ROG GFX71J ROG G751JY-T7186H GFX71JT ROG G751JM ROG G751JY ROG G751JT ROG G751J G751JT G751JY ROG G751JL ROG G751 GFX71JY4860 ROG GFX71 GFX71JY GFX71 G751

Replaces Part Numbers

A42N1403 A42LM93 A42LM9H 0B110-00290000M

Technical Specifications

Voltage15V
Amp Hours5200mAh
Capacity5200mAh
Rate78Wh
Net Weight420g /14.82 oz
Gross Weight600g /21.16 oz
Approximate Weight600g /21.16 oz
Dimension 136.40 x 55.80 x 37.20mm

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 G751J BIOS is showing the new battery as "unknown" or giving a 0% health reading straight after install — is the cell faulty?

The cell is almost certainly fine. The G751J reads charge history from EEPROM data stored on the battery pack, and a fresh cell has no history for the BIOS to read, so it flags the battery as unknown or worn. Run one full discharge to hibernate-cutoff followed by a complete uninterrupted charge to 100%. That resets the BIOS learn cycle and clears the erroneous health flag within one to two cycles.

Windows is showing the replacement battery at 78Wh but the Asus system info panel is displaying a different Wh figure — which one is correct?

The Asus system panel reads the rated Wh value stored in the battery's EEPROM at manufacture, while Windows pulls the figure from the fuel gauge IC as it measures actual charge acceptance. On a new cell, those two values won't match until the IC has calibrated against real charge and discharge data. The 78Wh figure in the product data is the correct rated capacity for this cell. After two full charge cycles, the system panel and Windows gauge should converge to a consistent reading.

The replacement battery charges fine but the charge stops between 79–82% and won't go higher — is the charger the issue?

The charger is not the issue. Asus BIOS on the G751 series includes a firmware-controlled charge limit that caps charging at approximately 80% when Battery Health Charging mode is active in MyASUS or AI Suite. This is a deliberate BIOS setting, not a fault with the cell. Open MyASUS, navigate to Battery Health Charging, and switch the mode to Full Capacity Mode — the battery will then charge to 100%.

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