A Steam Deck's battery doesn't run out at a fixed rate. It runs out at whatever rate you let the game demand, and most games will demand everything they're given. The six settings below put a ceiling on that demand. They all live in SteamOS's Quick Access menu, mostly under Performance, and none needs a plugin, a mod or Desktop Mode. One caution: SteamOS has had many updates since launch, and several figures here come from 2022 tests of the original LCD model, so treat them as examples of the mechanism rather than promises for your game.
Profile first, then cap the frame rate
A per-game profile changes nothing by itself, but it makes every later step stick. When Valve added profiles in 2022, Tom's Guide explained that each game saves the settings you choose and loads them at launch. Switch the profile off and the game returns to your global settings. That's the rollback for everything that follows.
Next comes the setting that does the most work: the frame rate limit. A game rendering 90 frames a second on a 60Hz screen spends power on frames you never see. As PC Gamer reported, Gamers Nexus ran Devil May Cry 5 uncapped with Vsync off and the Deck lasted 87 minutes at 50% brightness. With Vsync on, slightly lower settings and a 60 fps cap, it lasted two hours. The Phawx got around four hours from Forza Horizon 5 locked to 30 fps with a few settings adjusted.
The cap now saves a little more than it did. In a February 2025 beta, GamingOnLinux noted, Valve cut Steam Input's polling rate while the limiter is active, saying it can save up to 6% of battery at 30 fps in a light game like Half-Life 2. Valve's Steam Deck news feed shows the limiter is still maintained: SteamOS 3.9 fixed the "Disable Frame Limiter" toggle with VRR enabled.
Refresh rate and power limit
The frame limit and the refresh rate work as a pair. In the SteamOS 3.2 notes Windows Central reproduced, Valve said the LCD screen's default 60Hz offers limits of 60, 30 or 15 fps, while 40Hz offers 40, 20 and 10. Any whole number between 40 and 60 also works. Valve called 40Hz a sweet spot for responsiveness, consistency and smoothness, savable per game.
The logic is division. A cap that divides evenly into the refresh rate gives every frame the same time on screen. So if a demanding game can't hold 60, 40Hz with a 40 fps cap is a cleaner compromise than letting it wander between 40 and 60.
The Thermal Power (TDP) limit is the blunter tool. Where the frame cap limits how much work the game asks for, the TDP slider limits how much power the chip may draw, whatever the game asks. Digital Trends points to it in the same Performance section and says turning it down can save a lot of battery while traveling. The expected result is longer play with lower or less stable frame rates, so lower it gradually, and raise it again if the game starts missing your cap.
Shading and the screen
Half-Rate Shading trades some sharpness for power. Valve's April 2022 patch notes, published by VGC, describe it as an experimental Performance option that forces 2×2 Variable Rate Shading into existing games for power savings. Digital Trends recommends it for pixel art games in particular and warns it can really hurt image quality in more graphically complex ones.
Brightness is the drain that has nothing to do with the game. GamesRadar+ lists dimming the screen among the factors that change how long the Deck lasts, and Digital Trends notes the shortcut: hold Steam and push the left stick down. Gamers Nexus's 87-minute result was already at 50%.
The order, then. Enable the profile. Cap the frame rate at the lowest figure that feels good, and match the refresh rate to it. Lower the TDP limit until performance slips. Add Half-Rate Shading where it doesn't bother you, and dim the screen. Each step can be undone from the same menu.
Reporting notes
