If you’ve got an older MacBook, the battery almost certainly holds less charge now than it did when it was new.
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If you have a MacBook, MacBook Pro, or MacBook Air running Mountain Lion 10.8 or 10.8.1, install the OS X 10.8.2 update right away through the Apple Menu > Software Update, and enjoy the immediate battery boost. Losing 15 capacity over almost three years isn’t too bad at all. The difference in battery performance between OS X 10.8.1 and 10.8.2 is night and day and should give users who suffered under prior versions at least an hour or two longer while on the go. Interestingly, the release notes of 10.8.2 make no mention of battery improvements, but if you have experienced any reduction in battery life with Mountain Lion then updating to the latest version will demonstrate very obvious increases. This was shown by the Battery Time Remaining app and proved accurate while running a clock to observe battery drain under standard usage conditions at 70% display brightness. The largest boost was found on a 2011 MacBook Air 11″ model, which jumped from 3.4 hours to 6 hours on a full charge. Portable Macs running OS X 10.8.2 appear to run at lower temperatures and are noticeably cooler to the touch, perhaps suggesting the original battery life issue was related to power management or an errant background process.It shows you live information about the battery quality in your Mac, iPhone and iPad Download v3.9.9 Plus macOS 10. It's charging at the moment - and is up 2228 mAh - it seems as if there's a problem insuide the battery - it's the original one I'm pretty sure and the PowerBook is from 2001 or 2002. Dramatic improvements to battery life on three different MacBook Airs (2010, 2011, and 2012 models), each jumping by at least 2 hours to an average of 6 hours under normal use coconutBattery 3 The standard for battery reading since 2005 With coconutBattery you are always aware of your current battery health. PowerBoo battery capacity as shown on Coconut - it's saying 60,392 mAh when the original was 4,000 mAh.The following observations are anecdotal and not scientific by any means, but findings thus far with OS X 10.8.2 include:
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