The fastest way to extend battery life is to lower your screen brightness and close programs running in the background

Your screen uses more power than almost anything else on your laptop. Dropping brightness to 40 or 50 percent cuts battery drain noticeably without making the display hard to read. Most laptops let you adjust brightness with a keyboard shortcut — usually Fn plus an arrow key — or through your system settings.

Background programs drain power even when you are not using them. On Windows, open Task Manager (Ctrl + Shift + Esc), click the Processes tab, and look at the CPU and Memory columns. Close anything you do not recognize or do not need right now. On Mac, open Activity Monitor (Command + Space, type "Activity Monitor"), click the CPU tab, and quit programs using high CPU percentage.

These two changes alone can add 2 to 4 hours to a typical work session. The rest of this guide covers longer-term habits and settings that keep your battery healthy over months and years.

Key Takeaways

  • Reduce screen brightness to 40 to 50 percent and close background programs to add several hours of battery life when ready.
  • Enable battery saver mode (Windows) or low power mode (Mac) when you are below 50 percent charge to cut power use by 10 to 20 percent.
  • Disable Bluetooth, Wi-Fi, and keyboard backlighting when you do not need them, as each drains power even when idle.
  • Keep your laptop cool and avoid letting the battery drain completely or sit at 100 percent charge for long periods, which degrades the battery over time.
  • Close browser tabs, disable animations, and turn off location services to reduce the work your processor and storage have to do.

Turn on battery saver mode before you run out of power

Windows and Mac both include a power-saving mode that cuts performance slightly to stretch battery life. On Windows 10 and 11, open Settings, go to System > Battery, and turn on Battery Saver. Set it to turn on automatically when your battery drops below 20 or 30 percent. On Mac, go to System Settings > Battery and turn on Low Power Mode.

Battery saver mode reduces screen refresh rate, limits background activity, and slows your processor slightly. You will notice the difference most in video playback or games, but for email, web browsing, and document work, the slowdown is barely noticeable. The battery life gain is real — typically 10 to 20 percent longer on a single charge.

Do not wait until your battery is at 5 percent to turn this on. Activating it at 50 percent gives you more time to find a charger and prevents the stress of a sudden shutdown.

Disable wireless connections you are not actively using

Bluetooth, Wi-Fi, and cellular radios all search for signals and maintain connections even when you are not using them. If you are working offline or do not need to sync files, turn these off. On Windows, use the Quick Settings panel (click the network icon in the bottom right). On Mac, use Control Center (click the icon in the top right).

Keyboard backlighting also drains power. Most laptops let you turn it off or dim it in system settings or with a keyboard shortcut. If you work in good light, turning off backlighting can add 30 minutes to an hour of battery life.

Location services, which allow apps to know your position, run in the background and use your Wi-Fi radio. Turn this off in Settings (Windows) or System Settings (Mac) unless you need it for a specific task.

Close browser tabs and disable visual effects

Each open browser tab runs code and loads content, which makes your processor work harder and drains the battery. Close tabs you are not reading. If you regularly keep 20 or 30 tabs open, closing them down to 5 or 6 can add 1 to 2 hours of battery life, especially on older laptops.

Windows and Mac both include animations — fade effects when you open windows, smooth scrolling, and visual transitions. These look nice but force your graphics processor to work. Disable them in Accessibility settings. On Windows, go to Settings > Ease of Access > Display and turn off animations. On Mac, go to System Settings > Accessibility > Display and check "Reduce motion."

Video streaming is one of the heaviest battery drains. If you must watch video on battery, lower the resolution in your streaming app settings. Most services let you choose between 480p, 720p, and 1080p. Dropping from 1080p to 720p cuts power use noticeably.

Keep your laptop cool to protect the battery

Lithium batteries degrade faster when they are hot. If your laptop feels warm to the touch, it is working hard and draining the battery quickly. Make sure the vents on the bottom and sides are not blocked by blankets, pillows, or your lap. Use a hard desk or table instead.

Dust buildup inside the vents reduces airflow and traps heat. If your laptop is more than a year old and feels hot during normal use, the vents may be clogged. You can use compressed air to blow dust out of the vents from the outside, or take it to a repair shop for a deeper cleaning.

Avoid leaving your laptop in direct sunlight or in a hot car. Temperatures above 95°F (35°C) damage the battery permanently. If your laptop gets too hot, shut it down and let it cool before using it again.

Manage how you charge to extend battery lifespan

Lithium batteries last longest when they stay between 20 and 80 percent charge. Letting the battery drain completely to 0 percent or leaving it plugged in at 100 percent for hours at a time speeds up degradation. If you use your laptop daily, unplug it once it reaches 80 percent and plug it back in around 20 percent.

If you leave your laptop plugged in most of the time, some newer models have a setting to limit charging to 80 percent. On Mac, go to System Settings > Battery and turn on "Optimized Battery Charging." On Windows, this varies by manufacturer — check your laptop maker's control panel or settings app for a similar option.

Charge slowly when you can. Plugging into a wall outlet charges faster than a USB port, but slower charging is gentler on the battery. If you have time, use the slower charger.

Update your operating system and drivers regularly

Microsoft and Apple release updates that improve power efficiency. These updates often include fixes for programs that drain the battery unnecessarily. Check for updates monthly. On Windows, go to Settings > Update & Security > Windows Update. On Mac, go to System Settings > General > Software Update.

Outdated drivers — the software that controls your hardware — can cause your processor or graphics card to work harder than needed. Update your drivers through Windows Update or your laptop manufacturer's support website.

Frequently Asked Questions

Does closing the laptop lid put it to sleep and save battery?

Yes. Closing the lid puts your laptop into sleep mode, which uses very little power — typically 1 to 2 percent per hour. If you will be away for more than a few hours, sleep mode is better than leaving it running. Shut down completely if you will not use it for a full day or longer.

Will using an external mouse instead of the trackpad save battery?

Slightly. A wireless mouse uses more power than the trackpad because it maintains a Bluetooth connection. A wired USB mouse uses almost no extra power. The difference is small — usually less than 30 minutes over a full day — but it adds up if you use your laptop for 8 hours or more daily.

Does turning off Wi-Fi and using mobile data instead save battery?

No. Mobile data (cellular) uses more power than Wi-Fi because the radio has to work harder to maintain a signal. Keep Wi-Fi on when it is available. Turn off both Wi-Fi and mobile data only when you do not need internet at all.

Can I replace my laptop battery myself if it no longer holds a charge?

On some older laptops, yes — the battery slides out or is held by a few screws. On most modern laptops, the battery is glued or soldered inside, and opening the case voids the warranty. Check your laptop's manual or manufacturer website to see if the battery is user-replaceable. If not, contact the manufacturer or a repair shop for a replacement.

What is the difference between battery health and battery capacity?

Battery capacity is how much total charge the battery can hold — measured in watt-hours (Wh). Battery health is how much of that capacity remains after months or years of use. A new battery at 100 percent health holds its full capacity. After two years, a well-maintained battery might be at 85 to 90 percent health. You can check battery health on Windows with the command "powercfg /batteryreport" in Command Prompt, or on Mac with System Information > Power.