"The CMOS battery is located to the left of the CPU socket, just under the heat sink. ASUS oriented the battery in a vertical position, making it easy to get to as well as space-efficient."
X99 deluxe from which company?
The CMOS battery should be near the center of the motherboard, sometimes hidden between the first two PCI brackets so that it's not reachable with a graphics card installed.
There is no CMOS "Battery" to pull out. There IS a Clear CMOS button if that is what you need.
-Asus X99-Deluxe
This statement is partial untrue. There is a Battery (button/watch style) located on all motherboards to keep Time and BIOS setting from reverting to default.
look on the board for a shiny silver button battery. There is only 1 so it is hard to miss unless there is a component in front of it like a GPU.
"The CMOS battery is located to the left of the CPU socket, just under the heat sink. ASUS oriented the battery in a vertical position, making it easy to get to as well as space-efficient."