My game's rlly laggy

i was playing valo like the usual, but all of a sudden last night when i play, it's rlly laggy. so i tried to find out what's the issue, n i found out it's because of my laptop battery. but it's strange because when i close valo, the battery is fine. It only happens when i play valorant, and this issue never happened be4. Maybe anyone have some suggestion pls? i rlly wanna play valo again