In all cameras I use exclusively Bundle Star replacement batteries from the accessories. So far I had always had the best experience at a fair price so that, therefore, the question did not arise from an original battery when the system changes to Olympus OMD. In my Oly M10 Bundle of Star battery works totally great. The size is fit, nothing wobbles or slackens in the camera. The charge indicator of the battery is neatly displayed, loading the batteries in the original Star Bundle Oly charger functions without problems. With regard to the capacity and charging time, I can not detect any differences to the original battery. Therefore also this time: class product at a fair price and highly recommended!