my samsung s advance battery draining continously

[nikj]

my samsung s advance battery draining continously without any use. even when I power off the phone at night,it drops from 100% to 0% till morning. I even try the new battry but problem is same. one thing more the power start flowing back to charger when I connect through cable to the charger

 

[musical marv]

my samsung s advance battery draining continously without any use. even when I power off the phone at night,it drops from 100% to 0% till morning. I even try the new battry but problem is same. one thing more the power start flowing back to charger when I connect through cable to the charger

What model is this phone?