until it no longer unlocks the car, or on the dashboard it says Replace Key Battery!
Yes it does. They are essentially the same battery just produced by different manufactures.
you cant get it to work when it has been replaced.
Open the key fob and remove the battery which has a # on it, and then buy a duplicate.
CR 2032
Open the key fob, remove the battery and look and see what size it is.
The key battery for the ls400 is PN# br1216 www.lextechautomotivellc.com
Panasonic CR1618
cr2032
It should be a 3032 battery found at most all auto parts stores and sometimes walmart or radioshack
The battery size is CR2032. Pretty widely available at electronics stores
You can refer to the user manual if you want to reprogramme Audi A4 key.