The Olympus HLD-9 Power Battery Grip increases the working time of the Olympus OM-D E-M1 mark II mirrorless camera. It holds an extra BLH-1 Li-ion battery to double the shooting time. You can also connect the optional AC-5 AC adapter with the battery grip to charge the inserted battery internally. The battery grip controls are arranged just like the ones on the camera to give you an intuitive way of operating the overall unit. Also, the dustproof, splashproof, and freezeproof construction of the grip matches the durable chassis of the camera.