The Nikon MB-D17 is a multi-power battery pack and vertical grip designed for the Nikon D500 DSLR, offering extended shooting time and enhanced ergonomics for portrait and event photography. This professional-grade accessory features dedicated vertical controls including a shutter release button, AF-On button, multi-selector, and front and rear command dials for intuitive handling during vertical composition. The grip accepts multiple battery options, supporting eight AA batteries (alkaline, Ni-MH, or Lithium) via the MS-D12 holder, a single EN-EL15 Li-ion battery with the MS-D12EN holder, or an EN-EL18a high-capacity battery with the optional BL-5 chamber cover, providing flexible power solutions for extended shooting sessions. Additionally, the grip can be powered via AC adapter using the EP-5B power connector and EH-5b AC adapter for continuous studio work. The added mass improves stability and reduces vibration whilst repositioning the camera's centre of balance for more comfortable handheld operation, particularly beneficial when using larger telephoto lenses.