Is it charged between 90 and 100%?
How do you know it is not charging?
Have you checked help file in OSX and then called Apple?
Some good battery apps.
X-Charge Generates detailed logs along with a graph, though the graph has issues from time to time.
SlimBattery is a replacement for the menu bar icon. It conveys more information in a smaller amount of space.
Coconut distills the same information about your battery that can be found in the System Profiler. (Finder--->About This Mac-->More Info->Hardware>Power.
All are good applications that have never given me any problems.