Ex-Pro® Olympus BLN-1, BLN1 High Power Plus + Lithium Li-Ion battery for Olympus OM-D E-M5, EM5 (Electronics)
actually just purchased because no original battery from Olympus had to be found. Is at least as powerful, but requires an extra charger. Both together, however, is still cheaper than an original battery. Absolutely important Part, so that one at a "