2 days ago my battery drains rapidly. From fully charged till empty in 2 hours. And tthe phone was hot. I renewed the battery and installed the software as a new phone. Now it still drains within a few hours, even when I shut the phone off. What could be the problem?
You should either call Apple support or go to an apple retail store and have them run a diagnostic on the phone. From there they can tell you whether or not the battery is bad. If the battery is not bad it could be a software issue
https://www.apple.com/support/iphone5-battery/
also check this out as some iphone 5 models are known to have bad batteries.
iPhone 5 Battery drains when phone is off
