i know there's countless posts about this and everyone says not to worry but currently my battery cycle is at 80 and the battery health has been fluctuating between 89% - 94%, now it's at 88% and the FCC is at 5106. Condition is at "Normal". I've been reading that it's normal for the battery health to fluctuate between 90% - 100% but now it has dropped into the high 80s. the battery was bought new back in January, from apple. thoughts?