my samsung s4 is overheating without using it

[AC Question]

Its normal when i use it the temperature get rising.But the problem is that as i get it of from charging it began to get hot and the batery drains 15-20% /hour.please do u have any solution. I downgrade my s4 from 5.01 to 4.42 with odin .

 

[belodion]

What do your battery usage stats indicate after a period of normal use?

Also, the battery may be failing.