Battery draining overnight
I recently purchased a iPhone 5s 16GB from Virgin Mobile and for the last few days I've noticed that the battery has been draining drastically overnight. The other night I charged the phone before going to bed and I put it on Low Power Mode overnight. When I woke up in the morning the battery was down to 75%. This has happened about a few times the last few days. Anyone knows what's causing this?
iPhone 5s, iOS 9.2.1, null