| posts: 554 | Location: Argentina
One of the "problems" with the Iphone and a lot of phones is by design 100% charge is 4.35V, is the maximum safe limit for a Li-On battery so the cell degrade easily.
I never charge my phones at 100% by reducing the voltage .10v +/- doubles the amount of battery cycles. My iphone 6 have more than 200 cycles and the battery life is like brand new.
iPhones in my opinion is one of the most reparable phones in the market, only a few parts are glued and is pretty easy to take apart compared to other devices.
Really, like I said I support a number of different iPhones that my techs use, and from what other personnel use. We've got iPhones even back from 4's on our account because a couple people do not want to give up the size of them, and honestly if they work okay then I'm okay with that.