Battery not fully charging and draining quickly.

[pullmystrings]

I purchased a Galaxy S2 from T-Mobile about a week ago, and I've noticed that when I charge it, it seems to fully charge, but as soon as I unplug it from the power source (outlet, laptop), the charge immediately drops down to 97%. This is my first smartphone, so I'm really not sure what the problem could be or if it actually is a problem. Furthermore, the battery seems to drain rather fast, in my opinion. For example, browsing Tumblr (using wifi) for approx. 20 minutes will cause the battery to go from 97% to 90%. Is this something I should be concerned about?

 

[Tommy Clarkson]

This worked for me. Let the battery drain completely.. the let it charge to 100% while off. See if that helps. Gluck!