I agree with the above post... however to answer your question for you according to this user manual from the olympus site your camera uses the "LI-42B" battery. They have a generic replacement for it at sterlingtek.com here.
You might want to verify that battery number with the one that is currently in your camera before purchasing.
If you want an original manufacturer battery then just search for the battery number online or at bestbuy/hhgregg/walmart/or wherever is close to you.
Mod please move this thread to the appropriate place.