Hell, Intel Haswell in Apple hardware (15&quot; rMBP, mid-2015) rips through the battery, even on stock OS X.<p>I&#x27;ve been at home, on AC power, starting around 9-10% battery, where it tells me 12+ hours until full charge.  This laptop is 4 months old, and that scenario was only iTerm and Chrome open... :&#x27;(