So I used to have an android device and am about to buy an iPhone. I'm a bit troubled though about the battery life. Some of my friends owing an iPhone seem to be a lot out of juice. I'd like to know how long the battery life of a iPhone normally lasts (for example the iPhone 7). Is there a big difference with the plus version or is the bigger battery capacity entirely undone by the bigger screen? How will the iPhone 8 (and plus) do compared to their 7 counterparts?