I have a mid-2012 MBA that I have kept mostly connected to power, but have been careful to unplug and run on battery power at least once a week. When I do this, I run it down to about 40% then reconnect. Today I noticed that the battery status has changed from "good" to "service battery". The computer works fine otherwise. Should I be concerned about this? Thanks for any help.
MacBook Air, OS X Yosemite (10.10)
Mac notebooks- Determining battery cycle count
How many cycles are logged for your battery? Your battery is expected to last for 1,000 cycles before it drops to 80%.
That's what I thought too .... my cycle count is 188
Then the alert most likely is because the battery's relative power capacity has declined towards that 80% figure. This suggests the battery may be failing prematurely, so you should take it in for service. I don't know if this would be covered unless you have AppleCare that has not yet expired.
Thanks Kappy .... actually, the battery capacity has been around for 71%-73% for a few weeks now. The last time it was at or above 80% was at least 6 months ago.
This refers to the full charge capacity meaning what is shown after the battery has been fully charged as a percentage of the battery's fully-charged capacity when it was new.
Right, but it's still below Apple's threshold of 1,000 cycles before the capacity falls to 80% of what it was when new. Am I correct on this or missing something?
And thanks BTW for taking the time to help me.
You got it A-OK. You get a green star from me. 🙂
Mid-2012 MBA battery status
