There were different nice features followed by the official update of Xperia X10 to Android 2.3 like the sound stuttering, but the most annoying is the following.
I live in the Netherlands and here it's nice to use 3g a lot to have internet connection whenever you need it. Both on 1.6 and 2.1 I never run into the problems with battery using 3g. Moreover, there were problems rather with WiFi which ate battery a lot.
Unfortunately after I've updated the phone, things have changed. WiFi is working fine now though it seems to me that it's off when the display is off: it establishes connection for about 10 sec each time I turn on display. But when I turn on 3g for the night, on the morning the phone is out of charge.
I don't think it's about apps using 3g, since:
if these apps need the internet connection, they will use WiFi as well, but if I leave my phone with WiFi for the whole night, only about 2-5% of the battery are lost for the whole night long.
settings->applications->battery usageI can see that
Cell Standby = 35%while apps in total are about
That gives an idea that 3g connection is rather expansive for my battery - but I don't have an idea why did it happen after an update on v. 2.3.
I've never rooted the phone, so all updates were made in the right way. Hope someone can help me.