It definitely lasts longer, I usually take my phone off the charger at around 815 every morning and with my 5S I would have to charge it around 430 to make sure it lasted into the night, with my 6, I use it the same and it lasts all the way until 1030-11 with it either dying or having 10% left, that's with more YouTube watching and playing some games, so for sure it's an improvement, it's definitely as good as the iPhone 4 was when it first came out with iOS 4 and 5, it was a beast with battery life then, always knew Id never have to charge it during the day