Update for the T8888 users who want to upgrade the battery life:
On your phone is an app called "测讯工具". This is a Chinese development tool for calibrating and testing your phone. However, on my phone it drained the battery by not letting the cpu sleep. You can confirm this by checking *#*#4636#*#* -> battery history -> partial wake usage
If this is the case on your phone:
-Tryout the secret test mode by dialing *#*#2272#*#*, or some of the other codes: 1, 4248, 4227, 8041.
-Remove the bloody app: install Root Uninstall
. Now with Root Uninstall, make a backup of the Chinese app and uninstall it forever.
And presto: no more empty batteries without a good reason