Optimise your battery life
Your notebook battery life depends on your computer's configuration and how you're using the computer. Here are some settings and steps you can follow to get the most out of your computer's battery.
Check Battery preferences
The Battery pane in System Preferences has settings to help improve the battery life on your Mac notebook. To view Battery settings, choose Apple menu > System Preferences, click Battery or Energy Saver, then select Battery in the sidebar.
For maximum battery life, use the following settings:
- Turn on "Slightly dim the display while on battery power". This setting allows your Mac to adjust the display brightness to 75% when you unplug the computer from a power source.
- Turn off "Enable Power Nap while on battery power". This setting prevents your Mac from checking for emails or other iCloud updates during sleep, which improves standby time.
- Turn on "Automatic graphics switching". This setting lets MacBook Pro models with multiple graphics processors switch between them automatically to maximise battery life.
- Turn on "Low power mode". This setting reduces energy usage to increase battery life.
Adjust display brightness
By default, your display automatically adjusts the brightness to conserve power. If you turn off automatic brightness, you should turn it back on later to preserve battery life. To set the brightness automatically, choose Apple menu > System Preferences, click Displays and then turn on ”Automatically adjust brightness”. Find out how to adjust your brightness manually.
Check battery health
You can check the health of your battery in Battery preferences or the Battery Status menu:
- In macOS Big Sur or later, choose Apple menu > System Preferences, click Battery, select Battery in the sidebar, then click Battery Health.
- In macOS Catalina or earlier, hold the Option key and click the battery icon in the menu bar to reveal the Battery Status menu.
You'll see one of the following status indicators:
- Normal: the battery is functioning normally.
- Service Recommended: the battery's ability to hold charge is less than when it was new or isn't functioning normally. You can safely continue to use your Mac but you should take it to an Apple Store or Apple Authorised Service Provider to get your battery evaluated.
To get a service on your battery, contact Apple.
In earlier versions of macOS, the battery status might display Replace Soon, Replace Now or Service Battery if your battery holds less of a charge than when it was new or needs to be serviced. If the battery's lowered charging capacity is affecting your experience, get your battery evaluated at an Apple Store or Apple Authorised Service Provider.
While some third-party apps can report on battery health conditions, the data reported by these apps may be inaccurate and isn't a conclusive indication of actual diminished system run time. It's best to rely on the information reported in the Battery Health menu, described above.
Diagnose battery issues
Find out how to check your hardware, identify apps or features contributing to high energy use, and resolve charging issues.
A great place to start when troubleshooting battery issues is the built-in diagnostics that are available on your Mac notebook. Learn how to use Apple Diagnostics on your Mac.
If you don't find any issues with Apple Diagnostics, read on for more information about troubleshooting your battery.
Check the Battery Status menu
The Battery Status menu shows you how much charge your battery has and whether it's currently being charged. This menu is on the right-hand side of the menu bar.
The battery status menu also tells you if your display or any apps are using significant energy. Also consider closing any apps that are listed to save battery power.
If you use Optimised Battery Charging in macOS Big Sur or later, you'll see additional information when your Mac is connected to a power source, such as whether charging is paused or when your battery will be fully charged. If charging has been paused and you need your Mac to be fully charged sooner, click Charge To Full Now.
Resolve charging issues
Get help with other issues, such as if your Mac won't recognise a power adapter or charge to 100%.
If your Mac isn't charging
Confirm the correct wattage AC adapter for your computer. A power adapter rated for a lower wattage than is required for the system might not charge the computer reliably. If you're not sure which power adapter to use with your computer, learn how to find the right power adapter and cord for your Mac notebook.
For more help, find out what to do if your USB-C power adapter isn't charging your Mac notebook. If issues persist, shut down your Mac, close the display for 30 seconds, then try to charge it again. Or if you have an Intel-based Mac, reset the SMC.
If your Mac won't charge to 100%
If you use Optimised Battery Charging in macOS Big Sur or later, or use macOS Catalina or earlier, occasionally the battery may not display a full charge (100%) in macOS, even after the power adapter has been connected for an extended period of time. This behaviour is normal and helps to prolong the overall life of the battery.
If charging is on hold and you need your Mac to be fully charged sooner, find out how to resume charging.
Servicing the battery in your Mac notebook
MacBook, MacBook Air and MacBook Pro computers with built-in batteries should only have their batteries replaced by an Apple Authorised Service Provider or at an Apple Store. Attempting to replace a built-in battery yourself could damage your equipment, and such damage is not covered by the warranty.
Battery warranty information
Your Apple One-Year Limited Warranty includes replacement cover for a defective battery. If you purchased an AppleCare Protection Plan for your Mac notebook, Apple will replace the notebook battery at no charge if it retains less than 80 per cent of its original capacity. If you don't have cover, you can have the battery replaced for a fee.
Understanding batteries in Mac notebooks
MacBook, MacBook Air and MacBook Pro computers come with lithium polymer batteries to provide maximum battery life in a compact space. To understand battery technology and battery life, it's good to know common battery terminology:
- Cycle count: Batteries are expected to function for a certain number of cycles. This number represents the sum of total and partial discharge cycles throughout the life of the battery. You can see the cycle count limit for your computer by reviewing Determine battery cycle count for Mac notebooks.
- Full charge capacity: measured in mAh (milliampere hours), this refers to the amount of power the battery is capable of containing, minus the energy required to shut down the device. This number lowers as the battery becomes depleted with usage and age.
- Remaining charge capacity: this number represents the current amount of power left in the battery as measured in mAh (milliampere hours). Using the computer when not connected to AC power will cause this number to decrease as power is depleted from the battery.
- Defective: batteries are considered defective when they stop working due to a defect in materials or workmanship, or due to a manufacturing defect. Defective batteries are covered under Apple's one-year limited warranty and extended-service contracts.
- Load: the amount of activity being performed by a task or tasks. Certain power-intensive processes place a heavier load on the battery and result in a greatly reduced runtime per charge.
Learn more about the batteries used in Apple products.