I had the same problem with the battery. I found the problem was all the running apps, particularly Social Hub. The device Task Manager does not show all the runnings apps. I downloaded Memory Booster which has a Task Kill feature and I use that to kill ALL apps as soon as I turn on my phone. Before this my battery would drain 10% after turning it on for less than an hour and when I looked at battery usage I saw that it was Social Hub and display eating up most of the power. After getting memory booster my battery lasts a lot longer - 4 hours of idle time uses 10-15% whereas before it was only 1 hour to use 10%. I hope this helps.
thanks , but i already have memory booster , which is really great , but when i kill ALL the apps , some of them just re-launch , or shall i get the pro (paid) version of memory booster ?
and how long can ur phone battery stand now ? mine can bearly stand for 1 or 1.5 days ..