After 1 year the battery life on my 6S is terrible, I have to charge it every day. I always looked after it, I only ever have 1 app open at a time and I limit things like background refresh, but certain apps drain the battery so fast I'm better off using them while on charge. So I have some questions... What can I do to improve the battery life? Can somebody share some reliable charge cases? Is it worth buying a replacement battery through apple? For those who have had the 6S since it's release, what is your 6S battery life like?