The good news is that gaming laptop manufacturers have invested a good deal of effort into tools that will try to balance GPU performance with battery savings. Your laptop may have even come out of the box configured with some of my suggestions, but this varies widely by manufacturer, so be sure to check yours anyway.
Windows can set different power settings when you disconnect your laptop from a power source, and this is where your tweaking should start. Here are just a few things you can adjust to start with:
Power & battery and under "Power" you can choose from a few basic power modes. Most laptops default to Balanced, but you can switch to "Best power efficiency." In this mode, Windows will make small changes like turning off the screen sooner or limiting the CPU clock speed to save more power.
Check your manufacturer's software: Companies like Razer, MSI, and Asus have their own software preloaded on gaming laptops that provide more settings you can fiddle with. Some settings, like switching refresh rate (more on that below) when you're on battery power aren't available in base Windows, so be sure to check what's available.
Change your display's refresh rate
One of the other ways your display drains battery is with its refresh rate. While many games can get by with 60 or even 30 frames per second (FPS), some fast-paced and competitive games can utilize FPS in the multiple hundreds. If you're not playing a game where enemies are rapidly moving around the screen, you can save a ton of power by changing the refresh rate.
Search for "Display Settings" in your Start menu and select "Advanced display" towards the bottom. On this screen, you can change the refresh rate for your screen. This is a setting you'll have to change manually every time, so it might be a good idea to see if your manufacturer has a tool to automatically change refresh rate while on battery, first.
RGB LEDs themselves aren't super power-intensive, but most manufacturers include software to choreograph lighting effects and even make your lights responsive to your games. Turning this all off won't magically give you several hours of gameplay, but the power savings aren't negligible.
Adjust your game's graphics settings
You spent three months' rent on a gaming laptop with an RTX 4090 inside, and I'm about to suggest you play on Medium settings? Who do I think I am? Well, all that power doesn't mean much if your laptop dies 20 minutes after you start. So, if you're not connected to a power source, maybe turn the ray-tracing off.
Disable all the preloaded junk
You bought this laptop for gaming, but it's still a Windows machine. Which means it probably came preloaded with some stuff Microsoft—or the manufacturer—wants included that has nothing to do with gaming. Microsoft Teams, an application that I even found running in the background on the ROG Ally, is one example.
You can also take a look at any utilities running in the system tray to find bloatware apps you don't need. Typically, gaming laptops mostly come with bundled software that is relevant to gaming, but if there's extra junk, disable it.
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