After two and a half months of having my Xperia I MAY have worked out the issue, I tried everthing on the forums to no avail. Just by chance I noticed in the rural/smaller towns the battery worked OK, sometimes up to 3 days, but everytime I came back to Canberra it died within a day. Five days ago I changed the network connection to WCDMW Only and restared the phone, I beleive this the 3G network and the battery is lasting at least 3 days now. So is connecting the phone to the newer 4G towers effecting it I don't know! but I'm happy its working now....
