Default Very fast battery drain

Hello i used to have 6-7 hours screen on time.But now i only get 2 hours if im lucky)İ was using pa with franco now i turned to stock and franco.İts still the same.The main problem is i charge my device and start to use it.But percentage suddenly drops without a reason.İ was watching the exorcist(time waste) i started with %95 battery after i finished percentage was %14.
Any suggestions? İ calibrate my battery everyday but it still doesnt works.