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About battery cycles

1. Apple Macbook Pro 13 Battery Replacement
2. 13 Macbook Pro Battery Replacement
3. Battery For Macbook Pro (15-inch Mid 2010)
4. Battery For Macbook Pro 15 Inch
5. Battery For Macbook Pro

When you use your Mac notebook, its battery goes through charge cycles. A charge cycle happens when you use all of the battery’s power—but that doesn’t necessarily mean a single charge.

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Apple Macbook Pro 13 Battery Replacement

For example, you could use half of your notebook's charge in one day, and then recharge it fully. If you did the same thing the next day, it would count as one charge cycle, not two. In this way, it might take several days to complete a cycle.

Batteries have a limited amount of charge cycles before their performance is expected to diminish. Once the cycle count is reached, a replacement battery is recommended to maintain performance. You can use your battery after it reaches its maximum cycle count, but you might notice a reduction in your battery life.

Knowing how many charge cycles your battery has and how many are left can help you determine when a battery replacement is required. For best performance, replace your battery when you reach its maximum cycle count.

Follow these steps to access information about your Mac notebook battery, including its cycle count:

1. Hold the Option key and click the Apple  menu. Choose System Information.
2. Under the Hardware section of the System Information window, select Power. The current cycle count is listed under the Battery Information section.
   

Identify your computer

Cycle count limits vary between Mac models. For help identifying your Mac notebook, use the Tech Specs page or these articles:

Cycle count limits

Use the table below to see the cycle count limit for your computer's battery. The battery is considered consumed once it reaches the limit.

13 Macbook Pro Battery Replacement

Learn more

See these resources for more information about the batteries in your Apple notebook.

Reset the SMC on computers that have the T2 chip

If your Mac has the Apple T2 Security Chip, follow these steps. If you need help, contact Apple Support.

Battery For Macbook Pro (15-inch Mid 2010)

Notebook computers with the T2 chip

Before resetting the SMC, try these steps:

1. Shut down your Mac.
2. Press and hold the power button for 10 seconds, then release the button.
3. Wait a few seconds, then press the power button to turn on your Mac.

If the issue persists, follow these steps to reset the SMC:

1. Shut down your Mac.
2. On your built-in keyboard, press and hold all of the following keys. Your Mac might turn on.
   • Control on the left side of your keyboard
   • Option (Alt) on the left side of your keyboard
   • Shift on the right side of your keyboard
3. Keep holding all three keys for 7 seconds, then press and hold the power button as well. If your Mac is on, it will turn off as you hold the keys.
   
4. Keep holding all four keys for another 7 seconds, then release them.
5. Wait a few seconds, then press the power button to turn on your Mac.

Desktop computers with the T2 chip

1. Shut down your Mac, then unplug the power cord.
2. Wait 15 seconds, then plug the power cord back in.
3. Wait 5 seconds, then press the power button to turn on your Mac.

Reset the SMC on other computers

If your Mac doesn't have the Apple T2 Security Chip, follow these steps. If you need help, contact Apple Support.

Notebook computers with a nonremovable battery

This applies to MacBook Pro models introduced in mid-2009 through 2017, MacBook Air models introduced in 2017 or earlier, and all MacBook models except the MacBook (13-inch, Mid 2009).

Battery For Macbook Pro 15 Inch

1. Shut down your Mac.
2. On your built-in keyboard, press and hold all of these keys:
   • Shift on the left side of your keyboard
   • Control on the left side of your keyboard
   • Option (Alt) on the left side of your keyboard
3. While holding all three keys, press and hold the power button as well.
   
4. Keep holding all four keys for 10 seconds.
5. Release all keys, then press the power button to turn on your Mac.

Notebook computers with a battery that can be removed

This applies to all MacBook Pro and MacBook models introduced in early 2009 or earlier, as well as the MacBook (13-inch, Mid 2009).

1. Shut down your Mac.
2. Remove the battery. (If you need help removing it, contact an Apple Store or Apple Authorized Service Provider.)
   
3. Press and hold the power button for 5 seconds.
4. Reinstall the battery.
5. Press the power button to turn on your Mac.
   

Desktop computers

1. Shut down your Mac, then unplug the power cord.
2. Wait 15 seconds, then plug the power cord back in.
3. Wait 5 seconds, then press the power button to turn on your Mac.

Battery For Macbook Pro

About the SMC

The system management controller is responsible for managing behaviors related to these features:

• Power, including the power button and power to the USB ports
• Battery and charging
• Fans and other thermal-management features
• Indicators or sensors such as status indicator lights (sleep status, battery charging status, and others), the sudden motion sensor, the ambient light sensor, and keyboard backlighting
• Behavior when opening and closing the lid of a notebook computer

Resetting the SMC doesn't affect the contents of NVRAM or PRAM.