Dedicated to the Olympus OM-D E-M1 Mark II mirrorless camera, the 7.4V, 1720mAh BLH-1 Lithium-Ion Battery is a spare or replacement power source for the one originally included with the camera. Lithium-ion batteries are long-lasting power sources that can be charged or discharged continuously without developing memory effects. It can be charged with the BCH-1 Battery Charger.