Battery draining very fast on Iphone 4s?

My Iphone 4s is losing battery % like no tomorrow when I have 3g on and just using imsg. Is this a common problem or just mine?

Very common especially when you download the new software. All I do us try to exit out all the programs

It depends on what iOS version you have. When I had iOS 6 it killed my battery fast so you should keep it up to date I suppose. If this doesn't help see about a replacement because a battery costs more than an actual phone these days… It's rediculous