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Guide · Battery drain

MacBook battery draining fast? Why it happens and how to fix it

By the AI Repair team · Updated

If your MacBook’s battery runs down faster than it used to, the cause is usually something you can see and change: an app working hard, a bright screen, catch-up work after an update, or simply a battery that has aged. Here’s how to tell which it is, fix what can be fixed, and keep the battery healthy for longer.

In short

Check two things first. In System Settings › Battery, see whether Battery Health says Normal, and look at the usage graphs. Then open Activity Monitor’s Energy tab to find the app using the most power. Turn the screen down, quit what you don’t need, and use Low Power Mode on battery. If the battery is old or says “Service Recommended”, it simply holds less charge, and a new battery is the real fix.

1. Check your battery’s health

Choose Apple menu › System Settings, click Battery, then click the info button (ⓘ) next to Battery Health. On recent versions of macOS it shows the battery’s condition and its Maximum Capacity: how much charge it can hold compared with when it was new. On macOS Monterey, open System Preferences › Battery, click Battery, then Battery Health.

  • Normal means the battery is working as expected.
  • Service Recommended means it holds less charge than when it was new, or isn’t working normally. Apple says you can safely keep using your Mac, but it won’t last as long on a charge (Apple on battery health).

To see the cycle count, hold Option, choose Apple menu › System Information and click Power. Every MacBook with Apple silicon is designed to keep up to 80% of its original capacity at 1,000 cycles (Apple’s cycle counts). One cycle is a full battery’s worth of use, even if it’s spread over several days. Apple also warns that third-party battery apps might not be accurate, so trust what macOS says.

2. See when the battery drains

In System Settings › Battery, the graphs show your battery level over the Last 24 Hours and your energy use over the Last 10 Days, with how long the screen was on. Look for a steep drop. If the level falls while the screen was on, an app is the likely cause (step 3). If it falls while the screen was off or the lid was closed, something is keeping your Mac awake (step 6). On Monterey, the same graphs are under Battery › Usage History.

3. Find the apps using the most energy

Click the battery icon in the menu bar: apps using a lot of power are listed under Using Significant Energy. For the full picture, open Activity Monitor (press ⌘ Space and type its name), click the Energy tab, then click Energy Impact to put the hungriest apps at the top. The 12 hr Power column shows each app’s use over the last 12 hours, and Preventing Sleep says whether it is keeping your Mac awake.

Web browsers with many tabs, video calls, streaming and games are the usual suspects. Quit apps you aren’t using, close tabs you don’t need, and if one app always tops the list, check it’s up to date.

4. Turn down the screen and the keyboard light

The screen is one of the biggest users of battery. Lower it with the brightness keys, or in System Settings › Displays. Then, in System Settings › Battery › Options, turn on Slightly dim the display on battery. Under System Settings › Lock Screen, you can set the display to turn off sooner on battery when you’re not using it.

If your keyboard lights up, lower or turn off its light in System Settings › Keyboard, and set it to turn off after a short time without use.

5. Use Low Power Mode on battery

Low Power Mode reduces energy use to make the battery last longer. In System Settings › Battery, set Low Power Mode to Only on Battery, so your Mac uses it away from the charger and runs normally when plugged in. Some models show Energy Mode instead, with Low Power, Automatic and High Power for battery and for power adapter; choose Low Power under On battery. On Monterey it’s a checkbox under Battery › Battery.

6. Draining with the lid closed or while asleep

A MacBook asleep should lose very little charge. If yours drains overnight, something is waking it up or keeping it awake:

  • Waking for the network. In System Settings › Battery › Options, set Wake for network access to Never if you don’t need to reach your Mac from other devices while it sleeps.
  • Sharing. In System Settings › General › Sharing, turn off anything you don’t use, such as file or screen sharing.
  • Apps that keep it awake. Check the Preventing Sleep column in Activity Monitor’s Energy tab before you close the lid.
  • Accessories. Unplug USB and Thunderbolt devices you don’t need; eject a drive first, with the eject button next to it in the Finder sidebar. A faulty device can wake your Mac, and charging a phone from your MacBook uses its battery.

7. Draining fast after a macOS update?

Apple says that after an update you may see a temporary impact on battery life while your Mac indexes your files, downloads what it needs and updates apps (Apple’s note). Spotlight indexing alone can take hours or even days, and it finishes sooner when your Mac isn’t in use, is connected to power and is online (Apple on indexing). Leaving it plugged in and awake overnight helps.

Then update your apps as well: apps that haven’t caught up with a new macOS can use more energy than they should.

8. Keep it cool

Heat is hard on batteries. Apple recommends using a Mac where it’s between 10 and 35 °C (50 to 95 °F), and says higher temperatures can permanently reduce battery capacity, especially while charging. Don’t leave your MacBook in a hot car, keep it out of direct sun, and use it on a hard surface rather than a bed or cushion, which blocks the airflow.

9. Charge in a way that keeps the battery healthy

You can charge whenever you like; there’s no need to let the battery run down first. Two settings help it age more slowly:

  • Optimized Battery Charging learns your routine and waits at 80% until you’re likely to need a full charge. The battery menu then says Charging On Hold; choose Charge to Full Now if you need it sooner.
  • Charge Limit, on macOS Tahoe 26.4 or later on a Mac with Apple silicon, stops charging at a level you choose between 80% and 100%. In System Settings › Battery, click the info button (ⓘ) next to Charging, set the limit and click Done (Apple’s guide).

With a limit set, the battery menu says your Mac is charged to that limit. That isn’t a fault. Your Mac also charges to 100% once in a while on purpose. If the battery seems to drain while plugged in, check the charger: on macOS Tahoe 26.4 or later, the battery menu says Slow Charger when the charger is too weak for your Mac (Apple on charging messages). Use the adapter that came with it, or one with more watts.

When it’s time for a new battery

Batteries wear out with use and age, and no setting brings the lost capacity back. If Battery Health says Service Recommended, or your Mac is near 1,000 cycles and doesn’t last the day, a new battery is the real fix:

  • Apple’s warranty covers a faulty battery, but not normal wear.
  • With AppleCare, Apple replaces a battery that holds less than 80% of its original capacity at no extra cost.
  • Apple Stores, Apple Authorized Service Providers and mail-in service can replace it. Running Apple Diagnostics first gives them a reference code: shut down, press and hold the power button until Options appears, let go, then press and hold ⌘ D.

If the case bulges, the bottom no longer sits flat or the trackpad stops clicking properly, the battery may be swollen. Stop using your Mac: shut it down, unplug it, don’t press on the case or try to open it, and contact Apple or an Apple Authorized Service Provider right away.

Advice you can skip

  • Reset the SMC. On a Mac with Apple silicon it resets by itself; a restart does the job.
  • Calibrate the battery, or run it down to zero every month. Apple says there’s no need to let it discharge fully, and your Mac keeps its own measurements up to date.
  • Never go below 20% or above 80%. Apple says charge whenever you want. Optimized Battery Charging and Charge Limit look after the battery for you.
  • Turn on “Manage battery longevity”. That setting belongs to older Intel Macs.
  • Replace it at 500 cycles. MacBooks with Apple silicon are rated for 1,000.

Common questions

Is it normal for a MacBook to lose battery overnight?

A little, yes. A sleeping Mac still keeps some things running. If it loses a lot, something is waking it or keeping it awake: check Wake for network access, sharing, accessories and apps preventing sleep, as in step 6.

Can I keep my MacBook plugged in all the time?

Yes. Optimized Battery Charging holds the battery at 80% when it learns you’re usually plugged in, and on macOS Tahoe 26.4 or later you can set a Charge Limit. Your Mac takes care of the rest, including an occasional full charge.

Can I keep using my Mac when the battery says Service Recommended?

Yes. Apple says you can safely continue to use it; the battery just holds less charge than it did. Plan a battery replacement when it no longer gets you through the day. If the case starts to bulge, stop using your Mac and contact Apple right away.

Does Low Power Mode harm my Mac?

No. It reduces energy use so the battery lasts longer, which can make heavy work a little slower. It’s safe to leave on, and setting it to Only on Battery means your Mac runs at full speed when plugged in.

Why does my Mac say it’s charged to 80%?

That is Optimized Battery Charging or a Charge Limit at work, not a fault. Both stop charging early to help the battery last more years. Choose Charge to Full Now in the battery menu when you need a full charge.