You can certainly contact them, but your battery is operating well within its design specifications. The Service Battery warning on your Mac or Macbook Pro could mean that you need to service your battery. So is my battery defective or damaged in some way? as long as you follow Apple's recommendations above. You're not doing anything wrong, and it's not likely you can do anything to influence that either way. It could stay at 90% of design capacity for a long time, and probably will.

In other words if you are concerned that your battery will lose another 10% in another year or another 239 cycles, it won't. That rate of decrease is not linear at all. Over a shorter period of time, it can decrease or increase. Over a long period of time, a battery's maximum charge capacity will decrease. Please read About Mac notebook batteries - Apple Support and. What can I do about it, should Apple warranty cover it? I did not use it very intensive and never stored, charged or used it in a high or very low temperature.Īfter 10 months of usage and 239 battery cycles my MBA lost 10% of its power capacity. So is my battery defective or damaged in some way? Should I contact technical support? I still have the warranty which is valid till mid November. And I am not even mentioning the situation after reaching the 1000 cycles. I am worried how will it look in a year or so. Ten percent for a computer that should be usable for about 8-9 hours straight means that I have lost almost an hour of usability during the workday. Current maximum charge capacity for the battery is 4680mAh, which is around 10% lower than the design capacity, which should be 5100mAh. Its battery cycle count is 239 and as far as I know the battery should keep a good form for at least 1000 cycles. I know that batteries are not permanent, but I am using my MBA since November 2015, so it is not an old equipment yet. I have recently discovered that my MacBook Air battery performance is significantly worse than it used to be.

2013 mac air battery capacity