Hold your blackberry button and make sure most of your multi tasking programs are off? I just did that and hopefully my battery life will get better D:
Here is my run down on the BB Bold 9900 battery (using 2.61) Bell half wifi/half not. Moderate to heavy usage (calls,emails, social, texts etc.)
The battery is good enough to get me through a LONG day, solid no problems, however never 2 full days. I tested it out and had to charge at work about halfway through.