Unlike desktop computers that draw power directly from the wall, a MacBook relies on a lithium-ion battery. Over time, all lithium-ion batteries naturally degrade through chemical aging. This means that a MacBook which originally lasted 12 hours on a single charge might only last 6 hours after a few years of heavy use.
If you feel like your MacBook is dying faster than it used to, or if you are planning to buy a used MacBook and want to ensure you aren’t inheriting a worn-out machine, you need to check the battery health. Here is how to find your maximum capacity and cycle count in macOS.
Method 1: Checking Maximum Capacity in System Settings
The easiest way to check the overall health of your battery on modern versions of macOS (Monterey, Ventura, and Sonoma) is through the standard System Settings menu.
- Click the Apple logo () in the top-left corner of your screen.
- Select System Settings (or System Preferences on older versions).
- Scroll down the left-hand sidebar and click on Battery.
- Look for the Battery Health section on the right side. It will display a brief status, usually “Normal”.
- Click the small “i” (Information) button next to the status.
- A new window will pop up showing your Maximum Capacity percentage.
Understanding Maximum Capacity: A brand-new MacBook will display 100%. If your capacity says 85%, it means your battery can only hold 85% of the charge it could when it first left the factory. Apple considers a battery “consumed” and ready for replacement when this number drops below 80%.
Method 2: Finding the Exact Cycle Count (System Information)
While maximum capacity is a helpful percentage, the true technical measurement of a battery’s age is its “Cycle Count”. One charge cycle is completed when you use an amount of power equal to 100% of your battery’s capacity—even if you spread that usage over several days.
To find your cycle count, you have to dig deeper into the system hardware reports:
- Hold down the Option (Alt) key on your keyboard.
- While holding the key, click the Apple logo () in the top-left corner.
- Notice that the top option has changed from “About This Mac” to System Information. Click it.
- A dense hardware report window will open. In the left-hand sidebar, under the Hardware category, click on Power.
- Look at the main window on the right. Under the Health Information sub-heading, you will find your exact Cycle Count.
Understanding Cycle Count: Modern MacBooks are designed to retain up to 80% of their original capacity at 1,000 complete charge cycles. If your cycle count is approaching or has exceeded 1,000, it is normal to experience significantly reduced battery life, and you should consider scheduling a battery replacement with Apple.
How to Preserve Your Battery Health
If your battery is still healthy, you can slow down its degradation by enabling Optimized Battery Charging.
Go back to System Settings > Battery, click the “i” button next to Battery Health, and toggle the switch for Optimized Battery Charging. This intelligent feature learns your daily routine. If you leave your MacBook plugged in overnight, it will stop charging at 80% and only trickle charge the final 20% right before you typically wake up. This prevents the battery from sitting at maximum stress for hours on end, dramatically extending its lifespan.