Share your experience!
during this 8 hours, AUTOSYNC WAS OFF!!!
I would suggest that you repair your phone with update service
make sure to backup everything before hand
Update Service (SEUS)
http://dl-www.sonyericsson.com/cws/download/1/110/61/1317636927/Update_Service_Setup-2.11.10.7.exe
1st go to
settings -> about phone -> android version
do you have 2.3.4? if you do go to
settings -> privacy -> and make sure both options are selected
back up my data and automatic restore
if you do NOT have 2.3.4 then use this methods to backup your phone
Backup & Restore app
Use this links to download the apk
http://forum.xda-developers.com/showthread.php?t=1193802
or
http://www.elita-clan.com/downloads/backup_and_restore_v010935.apkhttp://www.elita-clan.com/downloads/backup_and_restore_v010935.apkor
http://www.mediafire.com/?1n07llajeaoo03y
How to install it
You need to
go to settings -> applications -> check unknown sources
download IO File Manager
https://market.android.com/details?id=org.openintents.filemanager&feature=search_result
download the backup & restore app, transfer it to your SD card, use OI file manager to find it -> tap on it -> install it
Contacts
just to play it safe sync your contacts w/ google if you haven't already
SMS/MMS
if you don't want to use the backup & restore app then
Install "backup SMS" to back up your SMS and MMS to your Gmail
https://market.android.com/details?id=com.zegoggles.smssync&feature=search_result
or your SMS use
"backup & restore SMS"
https://market.android.com/details?id=com.riteshsahu.SMSBackupRestore&feature=search_result
or for your MMS use "Save MMS"
https://market.android.com/details?id=com.schwimmer.android.mmsextract&feature=search_result
Call Logs
And for call logs this is great
https://market.android.com/details?id=com.yang.android.ansta
andoid version is 2.3.4 and i did the restore yesterday 
and you don't have a taskiller or apps like that, umm you should take it back to the store, it doesn't make sense that the battery last so little
but how long was the screen on ?
really not much...i used also the low brightness mode ..
i'm sad 'cause i love this phone!! is much better than my old iPhone 3g!
does this phone has Bravia Engine?
settings -> display -> bravia engine? if it does, it will drain a lot of your battery also double check how many hours the screen was on
see this when i was using 3g last night...
just see the drop..
i also recommended him to turn off the bravia engine..
dont know if he did or not..
this morning i put the phone in recovery mode and from then it worked good! phone is on from 16 hours and the battery is still 41%!!
thaanks very much to u 2
anytime
hmm 