An essential and excellent app!
I am using this app on an old MacBook Pro (13-inch, Mid 2009) after replacing the battery once and this app has certainly helped to regain some battery health (from 94 % to back 96 %). I wish I had found this app a lot sooner. This app is probably the first thing one should install after getting a new Mac Laptop for optimal battery health.
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FruitJuice - Battery Health