Progo Battery for Olympus BLN-1, Olympus OM-D EM-5, 1600mAh, Work same as Olympus original battery. Retail Pack. Progo brand Rechargeable extended power battery for Olympus OM-D EM-5 Rated at 7.6V and 1600mAh for a longer run time than the Olympus original High quality Li-Ion battery cell for for longer battery life. Absolutely no memory effect so that you can charge battery at anytime One year manufacturer warranty