Sony Ericsson — Low battery,Hangs frequently

Sony Ericsson — battery week

i priya brat pandey purchased a mobile in 16-06-08 but after 8 months the baterry will automatic discharge. i have lodrge to many complain in hots pot store no body can give me right suggesstion.
even i have keep the origional receipt which is given by hots pot stotre at the time of purchasing . and now when i try to call his no. no body pick the mobile no[protected]

details are as follows.
invoice no.[protected]
date 16/06/08
customer id [protected]
name - priya brat pandey
product- sony ericsson j120i night black
cash -rs.1780/-

Sony Ericsson — battery low

My sony ericsson K790i is before 5 min showing battery low and then shut down plz. help me.

my xperia phone not give me one day battry back up after doing all the setting in it so please help me in this case.