iOS Battery Drain

Scotty Loveless, overthought.org:

I made it my mission to discover the specific reasons for iOS battery drainage. This article is a product of my years of research and anecdotal evidence I gathered in the hundreds of Genius Bar appointments I took during my time as a Genius and iOS technician, as well as testing on my personal devices and the devices of my friends.

Thorough and comprehensive article on how to solve battery drain.

Source: overthought.org