I've had my rMBP since the start of July (2.3/16GB/256GB) and my battery health has always been at 98-98%. I left it in my car yesterday, it was fairly cold outside, and when I went to bring it back into my house, the thing was insanely cold, which leads to my battery life problem. I checked my battery health after the cold weather (and I know that cold weather has an effect on battery life), and it dropped from 98% to 85%! Is this big of a drop absolutely normal for cold weather? (-5c outside) I booted into Windows and ran some testing/benchmarking software to stress the battery and drain it, and it seems that now it's back to 98% after the drain, is anyone else noticing issues like this, is it normal?