I have definitely noticed an increase in battery drain since iOS 6.1 came out a few short weeks ago. At first it seemed subtle. Then it seemed to pick and up and be obvious. Yesterday I went from 100% to 0% in about 6 hours. Not normal. There are some technical reasons about calendars and exchange servers that caused this -which you probably don’t care about.
Among our Scale Faster (pcCentral) users, I know there are quite a few iOS device users out there. We just had one of our customers add iPads for their field team members a couple weeks ago and the more customer meetings we have, the more frequently I see iPhones and iPads.
So do yourself and your battery a favor – and apply this update. I’d love to hear back if this changes your battery life.