2032 Battery you need - https://amzn.to/499hukj

Here is a quick and easy demonstration video on how to replacement the dead / weak battery in your DTS / CTS key fob. If your fob has a button to remove the mechanical key at the bottom, the process is different and you should follow this instructional video -    • Cadillac - DIY Key Fob Battery Replac...   If it does not have a removable physical key, this is the video you need! The biggest tip is to be very careful when you're opening up the fob. The plastic is very brittle and can break easily. Insert the screwdriver as I've shown and give it a gentle twist. That will give you access to your weak / dead 2032 battery. The new one goes in + side facing upward. Close it back up and you're all set!

2008 - 2009 Cadillac DTS
2008 - 2013 Cadillac CTS
FCC ID: OUC6000066
Frequency: 315 Mhz
Battery: CR2032
Buttons: Lock, Unlock, Trunk, Panic
Replaces PN: 22889449
2008-2013 Cadillac DTS CTS / 4-Button Smart Key / PN: 22889449 / OUC6000066