In Big Sur, you can also use the Battery preference pane’s Usage History view to examine how and when your battery has been in use and when it’s been recharged. If you deplete to 50 percent on two successive days and recharge to 100 percent, it counts as one cycle.) (A cycle measures 100 percent of the capacity discharged, not the time between being unplugged and plugged back in. The more cycles, the lower total capacity the battery has remaining, though it should be both years and hundreds of cycles before you see degradation below 80 percent. The Cycle Count isn’t the number of times you’ve charged, but rather the total capacity of the battery divided by the total energy every used. Look for Condition there, where you can also see Cycle Count and, on certain models and versions of macOS, Maximum Capacity. In Big Sur through many earlier releases, you can hold down the Option key and select > System Information and click the Power item under Hardware in the left-hand navigation bar. If the battery dies entirely, an X appears through the battery icon, and the message reads No Battery Available. You may also see one of a number of other messages that Apple doesn’t document, such as Service Recommended, Replace Soon, or Replace Now, all of which have a little more urgency, as the operating system has deemed the battery holds a charge poorly, or even not at all. The condition should be listed as Normal, but if the battery’s maximum capacity has dropped below a certain point (which Apple doesn’t specify), it might say Service Battery. Big Sur shows the current battery parameters, but not battery health.
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