Your slow laptop might just have a battery problem

Published Nov 12, 2026, 11:30 AM EST Monica J. White is a journalist with over a decade of experience in covering technology. She built her first PC nearly 20 years ago, and she has since built and tested dozens of PCs. PC hardware is her main beat, and graphics cards and the GPU market at large are her main area of interest, but she has written thousands of articles covering everything related to PCs, laptops, handhelds, and peripherals. From GPUs and CPUs to headsets and software, Monica's always willing to geek out over all things related to computing. Outside of her work with How-To Geek, Monica contributes to TechRadar, PC Gamer, Tom's Guide, Laptop Mag, SlashGear, Whop, and Digital Trends, among others. Her ultimate goal is to make PC gaming and computing approachable and fun to any audience. Monica spends a lot of time elbow-deep in her PC case, as she's always making upgrades, testing something, or plotting out her next build. She's the go-to tech support person in her immediate circle, so she's never out of things to do. Whenever she has spare time, you'll find her gaming until the early hours and hanging out with her dog. I'm no big fan of laptops, so much so that I actually replaced mine with a mini PC and a tablet. But the problem with mine was that its performance, or lack thereof, was beyond help. Yours may not be in that same boat, though. Many laptops can perform well enough with proper power management, but if yours doesn't have that, investigate it before you write it off as e-waste. Your laptop is probably slower when it's unplugged And that's perfectly normal The constant battle against battery life is the main thing that sets laptops and desktops apart. Sure, the form factor matters too; it's not like you can easily pack up a hefty desktop and travel back and forth with it. But when you ignore that part, the biggest functional difference lies in the fact that laptops live and die by their battery, quite literally. There's not much point in having a portable PC if it dies within 30 minutes of doing anything demanding, which is why laptops need to carefully balance performance and longevity in a way that ensures you get enough of both. This is an easier balance to strike in thin laptops with no discrete GPU; gaming laptops typically are more of the "stay plugged in" type. Most laptops have to deliberately dial back their performance when they're running on battery power. Your CPU and GPU may operate at lower power limits, which can translate to lower clock speeds and, consequently, worse performance. As I mentioned, gaming laptops tend to have to stay plugged in. They do work when unplugged, but the performance drop is drastic, and manufacturers often tend to shy away from promising stellar performance on battery. Plug one into a wall outlet, and the performance should improve exponentially. This is perfectly normal behavior. Before you blame your laptop for being awfully slow, plug it in and check whether the workload is still just as bad. If it is, that could be a good sign pointing to problems with something else, although there are still battery-related issues to pinpoint. Battery-saving may be throttling performance Windows could be prioritizing battery life over speed Sometimes, your laptop isn't struggling because of its hardware, and it's not running the way it was intended to, either. Settings may throttle its performance. Stuff like BIOS settings can throttle RAM, for instance, but in this case, we're going to zoom in on the battery and see what's happening there. I'll focus on Windows, as that's what I use. Windows 11 has several power management settings that prioritize battery life over performance, and you might not even realize they're enabled. To check it out, head to Settings > System > Power & battery, and check the Power mode setting. If it's set to Best power efficiency, your laptop may be sacrificing some performance to squeeze more runtime out of its battery. In day-to-day life, this isn't necessary, unless you genuinely need the laptop to stay alive for hours with no charge. Try switching to Balanced or Best performance and see whether things improve. There's also Energy Saver, which can kick in automatically when your battery drops below a certain percentage. It reduces power consumption by limiting some background activity and other energy-intensive features, which can affect how responsive your laptop feels. Some manufacturers also have their own utilities with additional performance profiles that may be restricting your hardware. Tell XDB what you want the PC to do and how much you want to spend. We'll find parts that fit, with current prices. What will you use it for? Pick any Games or apps Optional Budget Plan my build Opens XDB, XDA's free PC builder, in a new tab. A failing battery can cause real performance problems Some laptops need their batteries for more than portability Of course, there's also the worst-case scenario, which is that it's not the settings that are to blame, but the battery itself. A failing laptop battery will echo throughout the entire system until you give it a look and possibly replace it. (Out of all the things you might need to replace in a laptop, the battery is far from the worst of it, so all in all, you're in luck.) The interesting tidbit is that a failing battery can sometimes affect your laptop's performance even when it's plugged in. Some laptops, particularly high-performance gaming models, actually rely on their batteries to supplement the power supplied by the charger during demanding workloads. Dell's Hybrid Power technology is a good example of this. Certain laptops can draw additional power from the battery when the AC adapter alone isn't enough, but if the battery charge drops too low, that extra power is no longer available, resulting in performance loss or stuttering. Yes, even when the PC itself is plugged in. Of course, not every laptop uses this kind of system, and an aging battery doesn't automatically mean worse performance. Ultimately, if you're seeing performance drops that could be caused by the battery, your best bet is to contact the manufacturer if the laptop is still under warranty. The charger could be the culprit That'd be great, actually Sometimes, the problem isn't your battery at all. And if it's not the settings (such as a Windows setting making your laptop overheat while it charges, we love that), not the battery, and not any other component in your laptop, then it could be the charger. To me, bar the free-to-fix settings stuff, this is the best-case scenario. Replacing a charger is usually much cheaper than dealing with a faulty battery. The thing is, just because your laptop says it's plugged in doesn't mean it's receiving enough power. If you're using an underpowered USB-C charger, a third-party adapter, or a cheap docking station, that can definitely happen. A good idea is to check the wattage your laptop requires, inspect the charger and cables for damage, and try to upgrade to an original adapter if you're using an aftermarket model. Check your battery before replacing the laptop Before sending your laptop off to greener pastures, take a few minutes to check its battery health. Windows has a handy built-in tool for this. Open Command Prompt, type powercfg /batteryreport, and hit Enter. Windows will generate an HTML report that you can open in your browser. Look for Design Capacity and Full Charge Capacity to see how much your battery's lost over time. If there's a significant difference, it might be due for a replacement.