Quote Originally Posted by soc View Post
Apparently there are 2 types of key for the R53 and mine had a rechargeable that is not suitable to replace - I think it can be done but a lot of reports suggest the keyfob is liable to break as you open it as they were never designed to be open. Obv I'm only going on what I've read but there are a lot of similar reports - most post's advised buying a new fob if the battery gives up the ghost.

No issues since thankfully
Is this your key type?

http://tinypic.com/view.php?pic=2qtczyt&s=7

If so it has a rechargeable battery. A little
trick that works wonders is to place or
Tape the key on top of an electric tooth brush charger!! The key (like an electric tooth brush) is charged by induction, while it is in the ignition slot. Putting it on top of the tooth brush charger will give it a good boost, trust me, it works!

If this is your key then you have a replaceable battery:

http://www.transponderautoparts.com/...uuton-shel.jpg