• Have any apps have automatic upates enabled?.....eg. Weather type apps or RSS feeds.
• To increase battery switch to 2G mode, won't affect delivery of emails and BBM much. On deciding to surf the web switch to 3G then. In options menu go to screen and font settings and lower backlight from 100 to 40.....but set it 10 (lowest).
NB: if the 9320 is few days old, full of potential of the battery takes 3 weeks to perform at its optimum level.