recently i saw about fast dormancy issuer on the galaxy s2 and i thought maybe its the same on i9003 and it was true!
i increased my battery life by disabling fast dormancy option that comes enabled by default
just type in the phone *#9900# and then choose dissable and then exit
if you want to reenable just enter the menu again
hope it helps!
fast dormancy is soupposed to increase battery life but qhen the operator doesnt support it it works the other way around
sorry if theres any mistakes on my writing!
http://www.icsforums.com/forum/showthread/6324
