My android system and android os are consuming more part of my battery

this problem has been troublimg me from the last few weeks I reported this problem at the Flipkart service center and they changed my battery and software.I even tried a factory reset but to no avail. i charged my phone in the afternoon . it lasted for aday and ahalf .while i was going to sleep the battery was about 58%..when i got up in the morning the battery was only 5%. I am completely tired.Please help me resolve this deadlock Ashish Tiwari