So the wife went to use the Fabia yesterday and got the spare car key out of the cupboard.

But no red light on the fob when pushing the buttons. ( Flat battery? ) This key is hardly used.

When I get home I try my key ( which is used every day ) and this still works.

 

So I think that the battery in the spare key that is hardly used, is flat.

So I swap the batteries over in the keys.

 

But the battery from my key wont work in the spare key.

So is there a fault with the spare key?

 

And the battery from the spare key wont work in my key.

So I swap the batteries back and then at least I have one working key.

 

Today I go to Bath with my key and when I try to come back, guess what. My key stops working, no red light on the fob.

 

So I get two new batteries, CR2032's are tight but will fit, and guess what, they both now work!

This is the first time I have fitted new batteries in either key in 7 years since new.

 

So does the battery last longer if you use it every day?

 

Thanks. AG Falco

 

 

They both will have expired through long term self discharge, the replacements probably wont last anywhere near as long but since you have fitted larger capacity ones perhaps they will.

 

Your keyfob will operate with a slightly lower voltage than the spare one.