Why does the battery on my Predator GX-791 or GX-792 drain when it is plugged in?
The Predator GX-791 and GX-792 will use power from the AC adapter and battery when the system demands maximum CPU and GPU performance. Under heavy usage conditions, the system will use more power than it can draw from the AC adapter. Although the AC adapter is a 330W power supply, the DC-in port on the notebook is designed to only draw 260W.
Note: The system will no longer draw additional power from the battery when the battery level drops below 30%.