In an interview with Mashable, Apple CEO Tim Cook responded to various criticisms of the Apple’s new iPhone 6s Smart Battery Case, ranging from the “hump” on the back of the case to the idea that the release of the case is a tacit admission by Apple that the iPhone 6s’ battery life is insufficient. Regarding the protruding “hump” on the back of the case — a feature that many see as an “un-Apple” aesthetic…