I have had my 9320 for 10 months. Until the 8 month mark, the battery life and phone was awesome but soon after I was getting less than 12 hours of life with little use: 10 - 20 texts, 6 emails, 20 mins of surfing. Also, radio would randomly turn off, saying 'Battery is too low for Radio use' even though I would have anywheres from 20% to 100%.
It's in for repair for the second time now. After the first repair (where they only flashed the OS), I was getting 9 hours or less. Backlight on 10%, Autolock after 20sec, only the 5 BB forced background apps running most of the time, and all other battery saving options. As I stated, I cut my usage down a lot.
My Palm Pre, I was getting at least 3/4 of a day with mid-heavy usage: at least 1 to 2 hours of surfing, +200 texts, gmail push, Facebook set to the highest refresh rate and Wifi Hotspoting, etc.
It has been 2 weeks since I sent out my 9320 the second time and I haven't heard anything yet. So hopefully this time it actually comes back fixed.
This is my first BB, so disappointed. My friend who uses his 9900 for work, under extremely heavy usage, +2 hours of talk a day, 40 to 50 emails at least, plus lots of texts, and he was getting more battery life than my 9320, and its the same battery!!