to all sony satio user, i just own 1 satio 2nd hand..

i wanna ask:
the battery wont last long, approx around 30 hours++ then going to empty already(shown red bar)

need help n advise

action taken: change to new battery and adjust the phone brightness to the lowest also the same, wont last longer then 1 day.. izit the battery IC for the phone is dead??