Tim Cook defends Apple iPhone Smart Battery Case, says it's not a 'hump'

Company chief tells users case is not designed for people who charge their phone every day, and that lump is a design feature

The reason the Apple Smart Battery Case has a bulbous lump on the back of it is because you shouldn't need it on all the time, according to chief executive Tim Cook.

"You know, I probably wouldn't call it 'the hump'," said Cook - immediately making it forever known as a the hump. He said it's so obvious because Apple considers the battery to be a backup device, something that you might need occasionally, not all the time.