Until now I have 2 Patona Premium in my Olympus OM-D E-M10 in use, as my acquaintance with the same camera. The battery is really good and I can see no disadvantage to the original battery, have the impression that the Patona Premium has a little more power. The mechanical dimensions are perfectly fine. It sits well in the camera, without wobbling or for tight fit. I'm concerned there's the full recommendation.