I purchased my MacBook just 2 weeks ago. The battery health was looking good until today... I open up Dashboard and it's reading 87% of it's health. This is a major change from the 99% I was at. I'm going to calibrate today/tonight to see if it makes a difference and if it's just reading wrong but at what point do you all think it would be acceptable for me to take the battery to the Apple store and get it replaced?