Steam Deck can limit frame rates to give you longer battery life
 

Valve may boast that the Steam Deck will run games well, but you won't have to worry about the handheld PC running games too quickly. As The Vergenotes, Valve's Pierre-Loup Griffais has revealed that the Steam Deck will include a "built-in" frame rate limiter option that caps performance in return for longer battery life. If you're playing a title that doesn't demand highly responsive visuals, you can trade some unnecessary frames for extra game time.

https://www.engadget.com/steam-deck-...6.html?src=rss