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

Your screen uses more power than almost any other component in your laptop. Dropping brightness to 40 or 50 percent—low enough to read comfortably indoors—can add two to four hours to a charge, depending on your machine. The second drain is background programs: web browsers with many tabs open, cloud sync services like OneDrive or Google Drive, and streaming apps all pull power even when you are not actively using them.

On Windows, open Task Manager (press Ctrl + Shift + Esc), click the Processes tab, and look at the CPU and Memory columns. Anything consistently above 10 percent CPU usage is worth closing if you do not need it. On Mac, open Activity Monitor (search for it in Spotlight), click the CPU tab, and close anything that is not essential. You will see the difference in battery life within a day.

Key Takeaways

  • Lowering screen brightness to 40–50 percent and closing unused background programs are the two fastest ways to extend battery life by several hours.
  • Enable Battery Saver mode on Windows or Low Power Mode on Mac to automatically reduce performance and power draw when your battery drops below a set threshold.
  • Disable Bluetooth, Wi-Fi, and keyboard backlighting when you are not using them, as each drains power even when idle.
  • Keep your laptop cool by using it on a hard, flat surface and cleaning dust from vents; batteries degrade faster when the machine runs hot.
  • Avoid letting your battery drain completely to zero, and do not leave it plugged in at 100 percent for days at a time, as both shorten the battery's lifespan.

Enable Battery Saver or Low Power Mode before you need it

Windows 11 and Windows 10 both include Battery Saver mode, which automatically throttles your processor and reduces background activity when your battery falls below a threshold you set. On Windows 11, go to Settings > System > Power & battery, scroll down, and toggle on Battery Saver. You can set it to turn on at 20 percent, 50 percent, or manually. When it is active, your laptop will feel slightly slower, but you will gain an extra two to three hours per charge.

Mac users have Low Power Mode, found in System Settings > Battery. Turn it on, and your Mac will reduce performance, limit background activity, and dim the display slightly. Unlike Windows Battery Saver, Low Power Mode on newer Macs (2016 and later) does not significantly slow everyday tasks like email or web browsing, so you can leave it on all the time without noticing a difference.

Turn off wireless radios and backlighting when you are unplugged

Bluetooth and Wi-Fi both transmit radio signals constantly, even when you are not actively downloading or syncing. If you are working offline or do not need internet for a while, turn both off. On Windows, use the Quick Settings panel (swipe in from the right edge or click the battery icon in the system tray). On Mac, use Control Center (click the menu icon in the top right). Turning off both can add 30 minutes to an hour to your battery life.

Keyboard backlighting is another straightforward win. Most laptops let you dim or turn it off by pressing Fn plus the brightness key (usually marked with a light bulb icon). Backlighting uses surprisingly little power on modern machines, but every bit counts when you are away from a plug. If you work in daylight or under good lighting, you will not miss it.

Keep your laptop cool to protect the battery itself

Lithium batteries—the type in every modern laptop—degrade faster when they are hot. Using your laptop on a bed, pillow, or couch blocks the vents and traps heat. Instead, use it on a desk, table, or a hard laptop stand that allows air to flow underneath. If your laptop feels warm to the touch on the bottom, it is working harder than it should be.

Dust buildup inside the vents also reduces airflow. If your laptop is more than a year old, use compressed air to blow dust out of the vents and any intake grilles. Hold the can upright, use short bursts, and do it outdoors or in a well-ventilated space. Do not open the laptop yourself unless you are comfortable doing so; if you are not, a computer repair shop can clean the vents for a modest fee.

Adjust power settings for your actual work

Windows and Mac both let you create power plans that match what you are doing. If you are writing or reading, you do not need high performance; if you are video editing or gaming, you do. On Windows 11, go to Settings > System > Power & battery > Power mode and choose Balanced or Power Saver for everyday work. On Windows 10, go to Settings > System > Battery saver and toggle it on.

On Mac, you cannot create custom plans, but Low Power Mode handles most situations. If you find your Mac is too slow in Low Power Mode for a specific task, turn it off temporarily, do the task, and turn it back on when you are done.

Manage how you charge to extend battery lifespan

Laptop batteries last longer if you avoid two extremes: letting them drain completely to zero, and leaving them plugged in at 100 percent for days. Both stress the battery chemistry. Instead, try to keep your battery between 20 and 80 percent most of the time. If you use your laptop plugged in most days, unplug it once a week and let it drain to 20 percent before charging again.

If you work from home and rarely move your laptop, consider removing the battery entirely if your model allows it (many modern laptops have batteries glued in, so check your manual first). Running on AC power alone eliminates the heat and charge cycles that wear out batteries. Just keep the battery in a cool, dry place, and reinstall it before you travel.

Close browser tabs and disable unnecessary startup programs

A web browser with 20 open tabs can use as much CPU and memory as a video editor. Each tab runs JavaScript, loads images, and checks for updates in the background. Close tabs you are not actively reading. If you find yourself opening the same sites every day, bookmark them instead of keeping them open.

On Windows, open Task Manager, click the Startup tab, and disable any programs you do not use daily. Common culprits are cloud sync services, messaging apps, and antivirus software with always-on scanning. You can always launch them manually when you need them. On Mac, go to System Settings > General > Login Items and remove anything you do not need to start automatically.

Frequently Asked Questions

Does closing the laptop lid put it to sleep, or does it keep draining the battery?

Closing the lid puts your laptop into sleep mode, which uses very little power—typically 1 to 3 percent of your battery per hour. If you will not use your laptop for more than a few hours, shut it down completely instead of leaving it asleep. Shutdown uses zero power.

Will using my laptop while it is charging damage the battery?

No. Using your laptop while plugged in is safe and does not harm the battery. The charger powers your laptop directly, and the battery management system prevents overcharging. However, if your laptop gets very hot during heavy use while charging, unplug it and let it cool down before continuing.

Is it bad to leave my laptop plugged in overnight?

Modern laptops have built-in protection that stops charging once the battery reaches 100 percent, so leaving it plugged in overnight will not cause when ready damage. However, keeping the battery at 100 percent for extended periods does shorten its lifespan over months and years. If you regularly leave it plugged in, unplug it once a week and let it drain to 20 percent.

Can I replace my laptop battery myself?

On older laptops (pre-2015), yes—the battery usually slides out or is held by a few screws. On newer models, the battery is often glued or soldered in place. Check your laptop's manual or manufacturer website to see if your model has a user-replaceable battery. If not, a repair shop can replace it, though the cost varies widely depending on the model.

Does restarting my laptop help battery life?

Restarting clears memory and stops any programs that are stuck running in the background, so it can help if your laptop has been on for days without a restart. However, the restart itself uses power, so do not restart just to save battery. If your laptop feels sluggish or the battery is draining faster than usual, a restart is worth trying.