You may use your computer during this time as long as the adapter is plugged in.ģ. Allow the battery to rest in the fully charged state for at least two hours. Plug in the power adapter and fully charge your PowerBook's battery until the light ring or LED on the power adapter plug changes to green and the onscreen meter in the menu bar indicates that the battery is fully charged.Ģ.

After that, you can connect and disconnect the power adapter when the battery is at any charge level.įor newer Mac portables (15-inch Double-Layer SD, all models of MacBook, and all models of MacBook Pro), follow these steps:ġ. Note: You have to fully charge and then discharge your battery only once to calibrate it. Connect the power adapter and leave it connected until the battery is fully charged again. At that point the battery has been sufficiently drained for calibration.ģ. Continue to use your computer until it goes to sleep. When your battery gets low, you will see the low battery warning dialog on the screen. Disconnect the power adapter and use your iBook or PowerBook. Plug the power adapter in and fully charge your computer's battery until the battery indicator lights turn off and the adapter plug light goes from amber to green, which indicates that the battery is fully charged.Ģ. The following machines have built-in batteries: MacBook (13-inch, Late 2009) and later, all version of MacBook Air, MacBook Pro 13”, 15”, and 17” released in early-to-mid 2009 and later, as well as the 13” and 15” Retina MacBook Pros.īefore starting the calibration process, save all of your work, close all apps, and disconnect any peripherals from your machine to avoid any data loss.įor older Mac portables (iBooks and PowerBook G4s other than the PowerBook G4 15” Double-Layer SuperDrive), perform these steps:ġ. With machines that have built-in batteries, calibration is a step that is not needed, as the batteries are pre-calibrated at the factory. If you rarely use the battery, then you’ll want to perform this process at least once per month. This calibration should be performed when you first purchase your machine, and then every few months after. To keep your battery operating at its maximum efficiency, and to ensure that the on-screen battery percentage/time display is accurate, you will need to perform a battery calibration from time to time. Each battery has a small chip that provides details about its charge and discharge cycles to the computer.

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