Your usage/experience matches mine. I'm going to try running the battery down to see if that helps.
I'm a bit frustrated because some people have been getting crazy-awesome battery life, and some have not. I bought the phone because of the battery.
i purchased a brand new samsung galaxy s2 a week ago and since the beginning i notice this issue with my battery
i keep my phone on charge from 10pm till 7am.
my phone is configured to the lowest brightness, 2g/3g off, wifi off, bluetooth off, gps off, auto rotation off, proximity sensor on, vibrate off at all times..
and even after this if i unplug my phone at 7am, i have around 89%by 10 without using one app also,
with my regular usage of voice calls being 1hr and internet(wifi)30mins (2/3g)15mins,30-50sms. and about few minutes at random intervals on whatsapp...
with all that usage. my batter barely last for 5hrs...
estimated battery charge remaining for 3hrs 10mins after getting it off the charger 1 1/2hr back
48%android os
36% display
7%internet
4%android system
4%cell standby
2%phone idle
i got a launcher installed and few apps of the stock market. activated wen i want to.
please tell me whether it shows any symptoms of hardware problem or is it just normal for it to be the bugatti of mobile world..(fast but no economy)