A few days ago I upgraded my 4 year old Samsung text message phone to the black color iPhone 4S 16GB version and I upgraded to IOS 5.1.1. I would like to know if my iPhone 4S has any battery drain issue? Here is a picture of usage.
It really depends on what you do on your phone. If you are heavy user, most likely you will be charging it overnight. If you are a light user, you could go for 2-4 days of usage without charging it depending on what you do.