I have the 8520 Curve and the battery life is really rubbish, on an average day of perhaps 10 calls, and around 30 messages, + 20 E-mails it just about lasts a day.
My partner has the iphone 4 and her's can last up to 3 days doing roughly the same about of usage,
I mean hers can also just last a day but at least the iphone 4 actually does stuff,
I even auto turn mine off at 1am and back on for 6.30am.
Is there an issue with my battery, i understand that this is classed as a cheap blackberry, is that maybe why the battery is so shocking?
Press and hold the blackberry button and see what applications you have running. There should be 5 that are always there: messages, browser, home, phone, and bbm. If you've got others up there that are still running that could be running your battery down. Also, if you're not using the wifi turn it off. I've had my curve for almost a year and I can go a whole day without any battery problems.
I have the 8530 and my husband has the storm 2, and we have about the same battery life. I'm on my phone constantly, calling, texting, facebook, shopping, you name it, and it lasts from 8 am to about 3 or 4 pm before I have to charge it.
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