Have and ordered a year ago this Hähnel battery of Ayex as a replacement battery for the Olympus OM-D EM 10. Is only sporadically detected by the camera during Ayex battery (see my product review there), there are no problems with the battery Hahnel. The capacity is sufficient, and the Olympus original battery has only an average battery life (if, for example by comparing against the batteries of the Fuji system cameras, they are much more powerful). Therefore offers the Hahnel Battery an excellent price / performance ratio and can be compared to the Olympus original battery save considerably.