how do i replace battery in 2007 ford transit blue key fob?

I have an eggy smell in my 2009 transit van. I think it is coming from the battery under the seat. It has 2 batteries,Will I be able to tell which battery is faulty

Simon
March 2020

you cannot replace these batteries in this type of key as they charge off the ignition barrel.there was a common fault with these keys failing due to solder holding battery failing.if your van is still got warranty cover you should get a new key free of charge.if it is not covered you can separate the key and try to resolder battery connections

rob
February 2010

take old one out and put new one in

fob
February 2010