When it comes to your Steam Deck's battery life, you're going to notice a lot of variability, even from one game to another. AAA games that rely on high-end GPUs will typically guzzle power. On laptops or desktops, that's usually not as much of a concern, but on the Steam Deck—when those games run at all—they can burn through the battery quickly.
There are a few common culprits for battery drain in games, and it's helpful to understand them before diving into solutions. This is because what works for one game with minimal performance impact, could make another game unplayable. With that in mind, here are a few key things that drain your battery:
Your refresh rate and FPS. Your Steam Deck has to update the screen dozens of times every second, and for some games it might be way more than necessary. 60 to 90 frames per second might be necessary for a fast-paced game like Doom Eternal, but it's overkill for Stardew Valley.
The most useful tool to help you diagnose your biggest battery drains is the Performance Overlay. Press the three-dot menu button while in a game and navigate to the Performance section and you'll see an option to enable this overlay. There are several levels of detail, ranging from a simple frame rate counter, to real-time power consumption and temperature readouts. The Performance tab is also where you'll find several useful features we'll discuss (under Advanced View), so it's good to make friends with this tab.
Dive into your game's display settings
This is particularly important to keep in mind if you play Steam games on multiple devices. Some games will try to sync settings between them, which can lead to your game rendering at a higher resolution or frame rate than the Steam Deck is even capable of displaying.
Resolution: The Steam Deck has a 1280x800 resolution, so unless you're using an external monitor, there's no reason to set your game to a higher resolution. Most games won't let you go higher anyway, but it's worth it to double check. You can also go lower for some games, if you don't need as much detail.
Graphical presets: If your game has a preset slider, try starting on the lowest preset and working your way up to see how the game performs. The Performance Overlay can be a huge help here, to see how much power your system is drawing on different presets. If your eye can't tell the difference, but your battery can, drop the settings.
As mentioned above, the number of times your game updates the screen per second can be a huge factor in battery drain. This is affected by both the screen's refresh rate (how many times the display physically updates the pixel you see) and your game's frames per second (or FPS, the number of times the GPU generates a new frame per second). To complicate matters further, your refresh rate can have an effect on your input latency, meaning it's important to strike a delicate balance.
It's a workaround that's placed somewhat late in the pipeline, and it's sometimes better to adjust your game's settings directly, but it simplifies a complicated process. If you'd rather adjust your display's refresh rate directly, you can toggle Disable Frame Limit and adjust the refresh rate from 45Hz to 90Hz directly. Keep in mind, though, you might still need to adjust some game settings to avoid generating frames your display will just throw out.
Put a cap on your Thermal Design Power (TDP), if you must
The problem is that games typically, you know, need power. And even games with really fine-grain settings don't generally ask the user to decide how much electricity to draw. For some, especially graphics-heavy games, putting a hard limit on TDP can cause massive performance drops or even game crashes.
Of course, setting a TDP limit only matters if it's below what your game was using in the first place. This is another area where the performance overlay comes in handy. You can get a sense of how much power your system is drawing during your games, and use that to gauge how low you want your TDP limit to be.
Don't forget per-game battery setting profiles
To use this, it's one simple toggle on the Performance tab. Enable "Use per-game profile" and the Steam Deck will automatically create a profile for every game you use. You can disable this toggle to switch back to the default, if you ever decide you prefer one consistent profile.
Keep in mind the profiles only account for the Steam Deck's settings itself, not any game-specific settings. But it's still a handy tool. It can be overwhelming to keep track of all the different buttons and knobs you can fiddle with to get extra battery life, but the Steam Deck manages to balance a ton of customization options with the simplicity of straight-forward, user-friendly tools so you can game longer.
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