Crackberry battery life

I recently purchased a blackberry curve 9330 for sprint and was looking into extended batteries. I’ve found 1800mAh and 2600mAh ones. Has anyone had any luck with the extended batteries? I don’t care about the size too much, i just want something affordable, solid, and reliable.

Also, what is your battery life like with the original battery on these phones?

i get between a day and a day and a half on my 9630, but I use it pretty much all day everyday. I have 2 batteries and a spare battery charger.

ive got the torch 9800, use all day long, facebook, interwebz, texting, WiFi, and calling.
i have yet to kill the battery in a day or even see a low battery warning.