One takeaway from Mark's videos was also a comparison between D500 and D850: He said, AF of D850 is as good as D500 - once the battery grip is attached and the EN-EL18b battery is in use. According to Mark, not only fps is improving but also AF performance.
Makes some sense to me - with X-T2 it was the same. Also, for APS-C the EN-EL-15 is enough power source, for double file size, bigger mirror and shutter it can be a bit more. It just makes the D850 roughly 1000,- $ more expensive and I'm hesitating to spend this kind of money for "just adding a battery grip" and also for "rewarding Nikon to make another expensive, not adding functions like charging battery within the grip"-device. And that's something I really don't like to do. Don't suggest Meike cheapos, I simply don't trust them to come up with a good, reliable, affordable version.
Makes some sense to me - with X-T2 it was the same. Also, for APS-C the EN-EL-15 is enough power source, for double file size, bigger mirror and shutter it can be a bit more. It just makes the D850 roughly 1000,- $ more expensive and I'm hesitating to spend this kind of money for "just adding a battery grip" and also for "rewarding Nikon to make another expensive, not adding functions like charging battery within the grip"-device. And that's something I really don't like to do. Don't suggest Meike cheapos, I simply don't trust them to come up with a good, reliable, affordable version.