I bought me a few weeks ago a MacBook Pro (Retina, 15-inch, Mid 2015) through eBay brand new (probably refurbished) but at a great price with only 1 battery charge. I did notice a small dent but for a $2700 computer I'm fine with the price I paid. Just recently I have started noticing that the battery capacity is varying a bit and I feel like it is not lasting as much as it should. I do have the AppleCare warranty also until 2018. Is it normal for the capacity to vary in just 42 charge cycles? Has anyone experienced this problem before? Thanks!