I plan on getting the 7 Plus this weekend because the battery life on the iPhone 6 over the past year started getting worse and I don't wanna spend time and money on getting the battery replaced, instead I am considering upgrading to the iPhone 7 plus, for people that made the jump from the 4.7" iPhone is this a good upgrade and how much better is the battery life better? I want to do this while the iPhone 6 still has somewhat of a decent resale value.