as long as the phone is ON it will consume some power resources bro. also sim card present la irukumbothu again usage aagitu irukumnga. so usage illatiyum 2 days once charge pannuvom. usage irukumbothu one day once charge pannuvom when SIM inserted. dont worry, continue following the charging practice and 2.5 years la neenga battery change pannuveenga when it reaches 80% battery health.
have a good day bro.