I have the first gen iPhone SE and a 5S as a backup. I've avoided updating because I don't want a phone the size of a tablet in my pocket. Now the battery is about cream crackered I'm not sure what to do. I'll probably end up replacing the battery, although I did that already for the screen and battery a couple years ago. Unfortunately I used one of these companies who come out to you so probably not Apple original parts so Apple probably won't put an OE battery in it. So it's another crappy aftermarket battery or replace it.