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My actual battery capacity has gone down since I purchased my phone. It's at 1032 mAh right now and its been 10 months from purchase. Can others also check and tell me if they have a decreased capacity
(To find out enter *#*#7378423#*#* --Service tests--Battery health test)
My battery dies within 24 hours after upgrade to ICS. Before it last around 48 hours.
It seems to be network eg sync, that eats up batteri..
Can others check their battery capacity as well and the period since purchase. Just checking the battery life
for heavy users 10hrs more or less is normal turn off fb inside xperia and your battery will last longer
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Problem solved 
Yesterday I ran the PC Companion update again, and was told I had the newest version, but was offered a repair. I choosed to repair, and was told that everything would be lost, settings, messages, contacts, etc
I ran the repair, and it started up like a new phone.
Seems like I got a clean install, and not a upgrade. My battery now acts as before ICS.