Why does my battery drained so fast?

[AC Question]

why does my battery drained so fast

I have my s4 for a couple of months now all of a sudden the battery started to over headed stopping my phone from work....I would charge my phone and not use it then when I came back It will be at 2%...so I went and got a new battery..the same thing keep happening...even while it's charging the battery keep going down i have turn off my phone so it's can charge....have no idea what wrong with my phone.