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2013 cadillac cts key fob battery.
Energizer battery cr2032 https amzn to 2decuq6 this video will go through how to replace the battery in your remote fob for 2014 2018 cadillac vehic.
See how to replace the battery in your 2013 2014 cadillac ats key fob keyless entry remote.
Instructions will help you change the battery in any cadillac including models such as cts ats xts srx elr escalade ct6 xt5.
Replacing the battery before it dies will save you from having to replace the fob reprogram it and if nothing else getting stuck on the side of the road.
Find the seam on the side of the fob and using a small flathead screwdriver pry the seam open on both sides.