Indentation on the side. Use a small screwdriver or coin. More detail: http://silentdevelopment.blogspot.com/2007/11/how-to-open-seatvwaudi-key-fob-to.html
pop it open, two batteries + side down
Take the metal key out of the fob and use it to press the button inside the key fob. That should release both side and enable you to open the key fob to change the batteries
Flip the key open. There is a tab, depress it with a paper clip to remove the key. A screwdriver can be used to pry the case open to access the battery.
Use a dime to open the key fob battery door on the key fob. New batteries are typically available at Radio Shack. Salesperson at same usually know how to open it.
the batteries are in the keyless go key .the owners manual shows you how 2 do it
OPEN THE SWITCH BLADE KEY. LOOK IN THE SLOT VACATED BY THE key. THERE'S AN Indentation close to the center of the key's length. PRESS IN THIS Indentation and pullout the bottom part of the key. remove the circular key chain, and pry open the cover. change battery, and assemble in the reverse order.
car batteries
Very carefully pry open the remote. I took mine to " Batteries Plus" and the guy was only to happy to open it and install the new battery. He had a little special gadget.
Open it up and you will find out.
with a fine blade or knife, prise open the key fob from the back. Remove the two batteries inside and replace with new ones. The fob will snap back into place after
Different batteries in all the different remotes. Just open the remote up and see what kind of battery it has.