I had bought two cheap batteries as a backup for my Olympus E-520. After a short time, unfortunately I had to realize that this after a few shots (about 100) were empty. The Hama battery, I bought then, by the power and capacity absolutely on par with the original batteries. For the still very favorable compared price you get a product that is inferior to the originals regarding Olympus. Performance and fit in any way. I am very happy with it and forgive it 5 stars.