Battery doctor I think is no longer on the App Store? Boost magic for your battery is pretty good, the paid for one. I let my ipad mini drain to 6% than charge to 100%. No longer than 12 hours, I believe that the longer you charge your battery the worse it performs. Also, I do a reboot before I charge it, hold down sleep button and home button (same time) wait for reboot, than charge to 100%.
This has worked for a couple weeks now. I don't recommend downloading 6.1.4 until others do, it should be out this month. I think Apple should give us the option to downgrade only when we have issues with a new update. I also heard Apple is gonna do away with the replace your phone, instead, Apple will fix your phone first. Apple is getting killed with giving away phones. Looked it up. It's true, it was gonna happen sooner or later. Can't blame em. How many company's do that? Not many.
I'm waiting for the iPhone 5s to come out, that will be my very first smart phone. Not a fan of Android or google. Better security with the iPhone. Not so good weather in buffalo ny.....:(