It its standard out-of-the-box setup, the D850 will achieve up to 1,840 still images or 70 minutes of video on a single charge of the EN-EL15a battery and will shoot at 7fps of continuous shooting.

However, when you marry the Nikon D850 with the MB-D18 battery grip, you achieve true pro-level speed and endurance.

The MB-D18 is a versatile battery grip that's capable of taking standard AA batteries, EN-EL15 or EN-EL15a batteries, or the EN-EL18B battery (from the Nikon D5). With the EN-EL18B battery in the MB-D18 battery grip, the Nikon D850 will shoot continuously at a blistering 9 frames per second and will achieve up to a phenomenal 5,140 still shots or 200 minutes of video on a single battery charge.

That's an entire day of wedding photography, wildlife photography, or sports photography without ever needing to change the battery and being able to shoot at 9fps as well, putting the D850 and MB-D18 kit in a class of its own when it comes to speed and endurance.

Key Features of the Nikon MB-D18 Multi-Power Battery Grip:

Takes standard AA batteries, EN-EL15 or EN-EL15a batteries, or EN-EL18B battery
Using EN-EL18B battery boosts D850's frame rate to 9fps
Enables shooting of up to 5,140 images using EN-EL18B battery
Weather & dust resistant sealing
Screw tripod thread connection
Additional shutter button & control dial