CR1616
Open the key fob, remove the battery and look and see what size it is.
Open it up and check and see.
Open the FOB and find out.
the key fob battery is the battey in a key fob torch
Panasonic CR 1616
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.
3 button fob 2003 onwards cr1616
This link will show you how: http://www.youtube.com/watch?v=Za7pCdUde3U
Lithium CR1632 (2008). I just replaced mine and got it from the dealer.
A small battery that fits in a key fob or remote.
You do not have to reset the key fob when changing the battery.