I did the battery calibration 2x and it went from 84% to 99.4% but still displayed the Check Battery / Service Recommended notification.... then I deleted the com.apple.powermanagement.plist and restarted.... Looks good now :)
[image|3648037]
This would have been the same result on any 13" MB Air model although I completed the task using a 2011 model just in case the battery did harm in its original state. Just to be safe.,