Meike is one of the world's leading producers of high-performance batteries and accessories. Meike believes there is no limit to the potential of portable power and as a company they will always strive to find innovative and efficient ways to power your life in the future. The Meike MK-550D holds 2 LP-8 batteries. This provides an extremely extended shooting time. Vertical shutter release also makes shooting with the camera in a vertical position just as comfortable as shooting horizontally.Weights 9 oz. (256g).