Ok, I love my Samsung GS2 and the battery life is amazing on it compared to any of my friends android phones... I have consistently gotten 2days + Of battery life from one charge with moderate use. Also if i am using it religiously it easily lasts a day. Hell i can watch streamed movies or even games / playstation Emulator and it will go for well over 10 hours on a single charge. HOWEVER!!! As of a few days ago my phone has started randomly becoming very hot in my pocket around the upper end of the phone, very near to the camera lens, so naturally everytime this happens i investigate and find that my battery is literally tanking down. It can drop 25% in 10 minutes... This seems to happen randomly and lasts for about 10-15minutes. So every couple of hours i lose 25% charge roughly whilst my phone becomes incredibly hot, i have turned my phone off during these periods a few times from fear of it overheating, once i turned it back on after it had cooled down i had lost 40% of my charge... Ive tried a few things like removing the battery for over a minute... Tanking my battery down to a very low charge and charging it back to full with the phone turned off as i heard this calibrates the battery. I have uninstalled a shit load of apps i stopped using and also any recent apps i had installed. Also as far as im aware it hasnt updated anytime recently nor is an update available for me at the moment. Im on Three (UK) if that helps... Anyway after fully charging it and not using it at all i waited until it got hot again then checked what was eating the battery, the two highest are Dialer and Google services. Ive tried a few things like clearing the data on these and forcestopping them. It hasnt made any difference at the moment nor does it hault the battery from tanking when this "hot mode" happens. At the moment i am draining my battery down until my phone dies then charging it back up to full, i read it worked for some other people however i dont think it will do anything as i feel my battery is fine... Hell ive been playing a streamed movie on it now for 4 hours from 16% battery and it still hasnt died on me yet. Anyway thanks for your time and for reading about my problem, and i hope someone can help me solve this issue. Im going to download an app later to track the battery usage in more detail, i believe its called better battery stats or something similar to that. Cheers.