Which Apps Drain Laptop Battery: How to Check

The fastest way to find which apps drain a laptop battery is the operating system's own usage list: Settings > System > Power & battery > Battery usage on Windows 11, and the Energy tab in Activity Monitor on a Mac. Sort by usage, look at the top three, and compare them with what you were actually doing.

A single browser tab or a stuck background process can cost hours of battery life. The steps below find the culprit, tell you how to judge whether a figure is normal, and list the settings that make the biggest difference after that.

Check the built-in battery usage list

On Windows 11, open Settings, go to System, then Power & battery, and expand Battery usage. Change the time range to the last 24 hours or 7 days. The list shows each app's share of battery use, split into screen-on and background time on many machines.

On a Mac, open Activity Monitor and choose the Energy tab. The Energy Impact column ranks running processes, and the 12 hr Power column shows a longer average. Holding Option while clicking the battery icon in the menu bar lists apps using significant energy.

Look at two figures for each app: how much it used, and whether it was in the foreground. High use from an app you were using is expected. High use from an app you had closed or hidden is the problem.

How to read the numbers

Use these rough rules to decide what is worth acting on:

• An app that you did not open but shows more than 10% of usage deserves a look.
• A background process that stays near the top over several days is a pattern, not a one-off.
• A single heavy hour, such as a video call or a video export, is normal. Nothing needs fixing.

These thresholds are practical guidance rather than fixed standards. Compare against your own baseline: note the usage list on a normal day, then look for what changes on a bad one.

The usual suspects

Four groups of software cause most unexpected drain:

1. Browsers. Many tabs, video sites and extensions keep processors busy.
2. Sync and backup tools. They scan and upload files in the background, especially after a large change.
3. Video and conferencing apps. They keep the camera, microphone and network active even when minimized.
4. Updaters and launchers. Game launchers and creative suites check for updates and run helper processes at start-up.

Cloud backups deserve special mention. A first backup of a large photo library can run for days. Pausing or scheduling a photo backup keeps that kind of sync from running on battery.

Find the heavy browser tab

Browsers have their own task managers. In Chrome and Edge on Windows, press Shift+Esc to see memory and CPU per tab and extension. On a Mac, use the Window menu and choose Task Manager.

Close or suspend any tab that shows high CPU while you are not using it. Common offenders are pages with auto-playing video, live dashboards, and web apps left open in the background. If one extension keeps showing up, disable it and watch whether the battery figure improves.

Build a battery report on Windows

Windows can produce a detailed health report from the command line. Run the command powercfg /batteryreport in a terminal and open the HTML file it creates. The report shows design capacity versus full-charge capacity, which tells you whether the battery has worn down.

If full-charge capacity is much lower than design capacity, apps are not the main cause of short runtime, and a replacement battery is the more useful fix. The report also lists usage history so you can see when long drains started.

Settings that save the most power

After closing heavy apps, these changes have the largest effect, in rough order:

1. Lower screen brightness. The display is usually the largest single consumer on a laptop.
2. Turn on the operating system's battery saver or low power mode when unplugged.
3. Reduce the refresh rate if your screen offers a lower setting.
4. Disable background app permissions for apps you rarely use.
5. Turn off Bluetooth and keyboard backlighting when not needed.
6. Remove unused start-up items.

Weak wireless signal also raises power use, because the radio works harder to hold a connection. If drain is worse at one desk than another, the router position may be the cause, so check Wi-Fi router placement in the house.

A simple test to confirm the cause

To prove which app is responsible, run a controlled test:

1. Charge to 100% and unplug.
2. Close everything except one app you suspect, and use the machine normally for 30 minutes.
3. Note the percentage lost.
4. Repeat with a different app or with nothing running.

Compare the results. If 30 minutes of idle time costs 5% and 30 minutes with the suspect app costs 14%, the difference is the app's contribution. The numbers are specific to your machine, so keep the notes.

Fixes that do not help

Some popular habits give little benefit. Closing apps that are not running, restarting the machine daily with no sign of a problem, and installing so-called battery booster tools rarely change anything. A booster app can itself consume battery. Stick to the built-in tools and the settings above.

Keeping the battery healthy

Battery wear also affects runtime. Heat is the biggest factor, so keep vents clear and avoid using the machine on soft surfaces while it works hard. Many laptops offer a charge limit setting in the manufacturer's utility, which stops charging at around 80% for machines that sit on a desk plugged in most of the time. Use it if you are rarely on battery.

A battery that holds 70% of its original capacity will give far shorter runtimes however well the apps behave, so check capacity before chasing software.

FAQ

Why does my laptop battery drain so fast when closed?

If the lid is closed and the battery still falls quickly, something prevented real sleep. Common causes are apps that keep the machine awake, network wake-ups, and hibernate or sleep settings. Check the sleep settings and look at recent wake events in the power report.

Is it normal for the browser to use the most battery?

Yes, for people who spend most of their time online. A browser at the top of the list is normal. A browser at the top while minimized is not.

Do dark mode & battery saver really help?

Battery saver does, because it limits background activity and lowers brightness. Dark mode helps mainly on screens that can switch pixels off individually, such as OLED panels. On regular LCD screens the effect is small.

How do I know if the battery itself is worn?

Generate the Windows battery report, or check battery health in the Mac's battery settings. A large gap between design capacity and current capacity means the cell has aged.

Next steps

Open the usage list now, note the top three apps, and run the 30-minute test on the one that looks wrong. Then apply the first two settings from the list, brightness and battery saver. If the machine still lasts less than half its original runtime, check the battery capacity before changing anything else.