How to Check Battery Health on a Mac

The lithium-ion battery inside your MacBook is a consumable component. From the day you buy it, the battery slowly degrades with every charge and discharge cycle. Over time, this degradation manifests as shorter battery life; your Mac might only last four hours instead of the eight it managed when new. Before you assume you need a brand-new computer, macOS provides built-in diagnostics to check the exact chemical health and cycle count of your battery, letting you know definitively if it is time for a replacement.

Understanding Cycle Counts and Maximum Capacity

Apple measures battery health using two primary metrics:

• Maximum Capacity: This is a percentage. A brand-new Mac is at 100%. If it drops to 80%, it means the battery can only hold 80% of the energy it could when it left the factory. Apple considers a battery to be “consumed” and in need of replacement if it falls below 80%.
• Cycle Count: A “cycle” occurs when you use 100% of the battery’s capacity. If you use 50% today, plug it in, and use 50% tomorrow, that counts as one cycle. Modern MacBook batteries are designed to retain up to 80% of their original capacity at 1,000 complete charge cycles.

Method 1: Checking Maximum Capacity (macOS Ventura and Later)

In recent versions of macOS, Apple has made the general health percentage very easy to find, similar to how it is displayed on an iPhone.

1. Click the Apple logo () in the top-left corner of the screen.
2. Select System Settings.
3. Scroll down the left sidebar and click on Battery.
4. Look for the section labeled Battery Health. It will display a quick status, usually “Normal”.
5. Click the small info (i) button next to the status.
6. A pop-up window will appear showing your Maximum Capacity percentage. If this number is below 80%, macOS will usually display a “Service Recommended” warning.

Method 2: Checking the Exact Cycle Count (System Information)

If you want the deep, technical details about your battery, including the exact number of cycles it has been through, you must look in the System Information app.

1. Press and hold the Option (Alt) key on your keyboard.
2. While holding Option, click the Apple logo () in the top-left corner.
3. The first option in the menu will change from “About This Mac” to System Information…. Click it.
4. A new window will open. In the left-hand sidebar, look under the ‘Hardware’ section and click on Power.
5. Look at the main window under the heading Health Information.
6. Here, you will find the Cycle Count and the overall Condition (e.g., Normal, Service Recommended).

Optimized Battery Charging

While checking your Battery Health (Method 1), you likely noticed a toggle for Optimized Battery Charging. You should ensure this is turned on.

Lithium-ion batteries degrade faster when they are held at 100% charge for long periods (for example, if you leave your MacBook plugged into a monitor all week). Optimized Battery Charging learns your daily routine. If it knows you usually leave for work at 8:00 AM, it will charge the battery to 80% overnight, hold it there to reduce stress on the cells, and then finish charging the final 20% just before 8:00 AM. This single feature can significantly extend the lifespan of your battery.

If your Mac is constantly dying quickly, but System Information says the battery condition is “Normal,” the issue is likely a rogue software application consuming massive amounts of CPU power in the background, not a failing physical battery.