A MacBook cycle refers to the period over which a battery is discharged then charged again. Your battery's cycle count isn't just a number; it's relevant for determining the health and longevity of your battery. After your battery has reached its maximum number of cycles, you should consider purchasing a replacement. Batteries past their maximum cycle count may not hold a charge for long, if at all. As of the time of publication, the battery in a new MacBook is rated for approximately 1000 cycles.
MacBook Battery Cycles
When your MacBook's battery is discharged and charged back to 100 percent, it has gone through a complete cycle. Battery life is often measured in number of cycles and not how long the battery has been in use, so keeping track of your cycle count can help you figure out when you might need to replace your battery. For a cycle to complete, the battery must be fully discharged. For example, if you discharge your battery halfway one day, then halfway again the next day, this counts as one cycle, not two.
Check Current Cycle Count
Your MacBook keeps track of your battery's cycle count and you can access it at any time. Click the Apple icon on your menu bar, click "About This Mac," then click "System Report." Under the Hardware section, click "Power," then look for "Cycle Count" under the Battery Information category. From here you can also check your battery's health and other important information.