Dave LeGear
Vello BG-N21 Battery Grip for Nikon Z series camera
Need more battery life for your Nikon Z series camera? Well, this one from Vello I think you would like to try and at a lower price point (almost half) than the Nikon version.
And this one has several Key Features:
Accepts Two EN-EL15a/EN-EL15b Batteries

Doubles Camera's Battery Life
Extends Shooting and Recording Time
Extended Grip for Vertical Composition
2.5mm Shutter Release Cable
Control Lock for Vertical Shutter Button
In-Grip Battery Charging via USB-C Port (love that feature!)
Rubberized Nonslip Grip
Threaded 1/4"-20 Tripod Socket
And will hold the factory battery door from the body inside the grip while it is being used.
As for myself, I set my Z6 up to grab some Lighting shots and other types of low light Photography as seen by clicking here which takes time and can chew though a battery. By having this Battery Grip installed not only does it extend my shooting time, but I can test and look at each separate batteries charge levels.
I also discovered that I could hook up an external power pack to the charge port on the battery grip, and really extend the amount of shooting time if needed.
So, give one a try if you are looking to have some extended run times on your Nikon Z series camera's and let us know how they work out for you!
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Tight Lines, and God Bless!
Dave