IPhone 4S battery charges till 97%?

After 2 hours and half It stopped at 97% and then I had to use it like turn on Wi-Fi and turn it off and airplane mode on and off and then it completed to 100% by three hours almost. Is that normal? Thanks
It was completely empty when I started it

Added (1). I read an article on apple website saying for mac batteries they desinged the battery for not taking upto 100% to avoid additional wearing to the battery. Is it the same case?
This phone is brand new it doesn't have apps on it

Alot of the time background applications are causing the phone to not charge fully, fast. To turn off back ground apps on an IPhone double press the circle button, and a little thing will pop up at the bottom, X out all the background apps and it should help!

What she said ^^
If you don't end those apps, it's a major killer for your battery. Even if you are charging it.