Iphone 3g battery replacement. where to buy?

[Dallane]

Well i have searched the forums and looked around a bit for this info and cant find it. My iphone is out of warranty and recently had water damage. I dried it out in a bag of rice and everything works perfect with it still except the battery life is about a hour or less. I am looking to replace the battery and i am not sure where a good place to buy these types of products are. I found one on amazon but it is 1150 mAh, isn't that lower then the current battery? i have also found others from other sites that are 1600. If anyone could help out i would really appreciate it. thanks