Hi. Location service, Bluetooth, app refresh, iCloud is off. My battery drains 70% every night. Sometimes I look if i have sms and its 20%, then i look in 30sec again and its already 15%. Can't show you stats because in Battery settings there are "-" and it never shows different. I reset the phone, didn't help. Tried every method i could find in google, didn't help. Should i try to replace battery as last option? Any advice? Ps. i don't have proof of buying papers, so going to apple store is probably useless.