First off, i love my rMBP, wouldn't return it for the world. But i observed the following and wanted to know if it was normal? Played about 2.5 hours of Diablo 3 tonight, power was connected. Settings were 2880x1800, all High Settings, Shadows Off, no AA... Anyway while playing i noticed my battery charge go from 93% to 90% even though it was plugged in the whole time. Is this normal under heavy load? Thanks.