Hello,
I bought my xperia ray last october. After 3 weeks it refused to switch on after I left the battery empty out completely (see my thread about this on this forum). I sent it to a sony service center and got it back with a sticker on the battery that says "85% OK". I'm not sure if this was a new battery.
Anyway the phone was working fine, but the battery autonomy was pretty poor: less than 24 hours without doing anything special (sms, 10min of calls, 10min of web connection, data disconnected the rest of the time).
I then try to let the phone discharge by itself in flight mode, screen off, starting with battery at 100%, and got the following results: battery at 55% after only 12h (see screenshots below).
I'm pretty sure this is not normal...
Am I good for a new ride to sony service center?
I use gingerbread 2.3.4.
Sometimes I have the same issue, even in flight mode My juice will ran out quickly... 
And I did mentioned sometimes 
Hi, is there any background application running in your fone? Background application can relly affect the battery.. Check that out, and ya, it there is still problem, you r good to go to the service center...
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