Vello BG-N19-2 Battery Grip for Nikon D850.
Started with the Vello BG-N19, switched to Mcoplus. Both grips had an issue with the BL-5 battery door. Wiggling the door caused the card access green light to blink, and FR would drop from 9fps to 7 fps. Stuck a piece of rubber band in the door which solved the problem but annoying.
Enter the new BG-N19-2. Winner winner chicken dinner. Door problem solved and grip feels nicer. More tacky and solid feeling, mounts with absolutely no flex what so ever. Was ready to pony up for the OEM, glad I gave it one more shot.
BG-N19-2 + DSTE BL-5 + Wasabi EN-EL18. Highly recommended.