Start with Low Power Mode and the Battery Health panel
Open System Settings and choose Battery. On a MacBook you will find a Low Power Mode menu with choices such as Never, Only on Battery and Always. It reduces processor and graphics speed, so the Mac runs cooler and charge lasts longer. The trade-off is real: exports, video edits and big downloads take longer. If you mostly browse, write and answer email, set it to Only on Battery and leave it.
Next, click the info button beside Battery Health. You will see a condition label and a toggle for Optimised Battery Charging. With it on, your Mac learns your routine and holds charging near 80 percent until shortly before you usually unplug, which slows wear if you sit at a desk for hours. Need a full battery before a trip? The menu bar battery icon lets you charge to full once without switching the feature off. A Service Recommended label means the battery has aged enough to replace, so check it before blaming settings.
Heat matters too. A Mac on a duvet or inside a closed bag cannot shed warmth. Our laptop care habits guide covers airflow and surfaces.
Use the Energy Impact column to find the real drain
Guessing is slow. Open Activity Monitor from Applications, then Utilities, and click the Energy tab. Sort by Energy Impact for current load, then look at 12 hr Power, which averages usage over a longer stretch. That second column is the better clue, because a quiet app that wakes the processor all day can cost more than a flashy one that spiked briefly.
Check the Preventing Sleep column too. If an app says Yes, it is stopping parts of your Mac from idling, a common reason a closed laptop is warm in your bag. Apple’s page on changing energy settings on a Mac explains the related options if your menus look different. For a quick look, click the battery icon in the menu bar, where macOS lists apps using significant energy.
Trim login items and background items
Go to System Settings, then General, then Login Items & Extensions. Open at Login lists apps that launch when you sign in. Allow in the Background lists helpers that run without a visible window, such as updaters and sync agents. Many apps add themselves there without asking.
Switch off anything you do not recognise or would rather start yourself. You are not deleting the app, only stopping it from waking on its own. Cloud storage tools, printer helpers and old chat clients are typical candidates. The catch is that a sync tool you disable will not sync until you open it, so leave on anything protecting files you cannot lose. Give browser extensions the same pass, since each can run code on every page you load.
Tame the display, tabs and windows
The screen is usually the biggest single consumer. In System Settings, choose Displays and lower brightness until text is comfortable, not maximum. On a ProMotion screen, the Refresh Rate menu offers ProMotion or a fixed 60 hertz. ProMotion drops its rate when nothing moves, so it can save power, but fixed 60 hertz gives steadier behaviour if you want predictable battery use. Under Keyboard, you can also switch the backlight off after a short idle time. If you work late, our night screen habits article pairs well with a lower brightness level.
Tabs count as well. A page with autoplay video, a live dashboard or a web app that polls a server keeps the processor busy while you look elsewhere. Chrome has Memory Saver under Performance settings, and Safari handles idle tabs on its own, but closing what you will not touch today works better than either.
When a single app is the drain
If one app keeps topping Activity Monitor, work through these steps in order. Quit it normally, reopen it, and see whether its number settles. Check for an update, since battery fixes often arrive in small releases. Then look in its own settings for hardware acceleration, live previews, auto refresh or background sync, and turn off what you do not need.
Still high? Restart the Mac, because a stuck helper process can survive for days. After that, remove the app from Login Items and open it only when needed, or try a lighter alternative or its web version. Force quit only an app that is clearly frozen, and save work first. Compare the numbers again after a day, because one reading tells you little while a repeated pattern names the culprit.