Q: Time Machine Back Up may have flattened MBA Battery
I fully charged my mid 2011 11 inch MBA's battery after backing up. I left the MBA's back up portable HDD plugged in overnight. Flat battery next day! Question: with Time Machine switched on enabling its default operation, is it able to switch the MBA on and do hourly back ups to the point of a flat battery? Upon plugging in the charger and booting the MBA, there was a message saying the back up HDD had not been properly dismounted. Then again I may have inadvertently left the MBA on/asleep. Or is there some other explanation?
iPhone 3GS, iOS 6.1.6
Posted on Sep 5, 2014 4:10 AM
The tech specs are MacBook Air (13-inch, Mid 2011) - Technical Specifications which has a non-user replaceable battery and 160 cycles is good. It should last roughly about 3+ years, but condition being normal, may last longer.
Typically MBA should have woken up about 8-10 times on battery in an overnight window, which should not have drained the battery. It should sleep properly. The error about disconnection of the disk can be verified in Applications -> Utilities -> Console logs for the exact time of the disk disconnect, which should give you an estimate of how long the MBA was without the drive connected. Repeated disconnects should also be checked for.
Posted on Sep 5, 2014 7:10 PM