Games Lag When Running on Battery

Jun 20, 2018
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Whenever I run Fortnite on my laptop with my monitor and charging at home, the laptop runs smoothly at around 120 fps. Even, if I am not using a monitor, Fortnite runs smoothly while charging. But, when I am on battery, monitor or not, it is super laggy and I get around 30 fps. I am not sure why. I checked my settings and the performance is max on battery and charging. Is there a way to fix this?