2032 Battery you need - https://amzn.to/3QiUJ6B

Here is a quick and easy video on how to replace the dead / weak battery in your Kia or Hyundai key fob. You will need a flat tip screwdriver and a fresh 2032 battery. First step is pry the two halves apart and gaining access to the dead battery. Then use your flat tip screwdriver and push out the 2032 battery. Next, place the new battery in + side facing up and clip the two halves back together. Once you do that, test it by ensuring the red light is flashing on the front of your fob. That is all! No need to reprogram. Hope you found the video helpful!

Key Fob Keyless Entry Fits for Hyundai Elantra Sonata Kia Optima 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 Remote Control Replacement OSLOKA-310T 95430-3K200 3 Buttons