Chimaera 400 key fob battery change…

[ChrisW500]

Hi all

Quick question... I suspect that after 20 odd years the battery is reaching the end of its life! You just can't get value for money any more !!!!

So my question is what battery do I need, and the correct process to do it as I have only one fob and don't want to loose use of the car!

Here is the fob:

[TVRMJ]

The Fob uses two CR1220 batteries stacked on top of each other. I used a thin blade pocketknife inserted at the seam to pry the two halves apart. The two halves just snap back together again

[ChrisW500]

Many thanks … I assume there is no time limit to do it or potential loss of program?

[TVRMJ]

I had my batteries in hand before starting. Took all of 5 minutes start to finish

[sixor8]

To be safe, do it when the car is unlocked, just in case.....

You may have to press the button on the fob a few times after fitting new batteries until the rolling code synchronises.

[ChrisW500]

Many thanks!

[Classic Chim]

When you prise your fob open try and do it gently, look carefully how the batteries are orientated to eachother, so you only have to do it once

[Dr Mike Oxgreen]

sixor8 said:

To be safe, do it when the car is unlocked, just in case.....

You may have to press the button on the fob a few times after fitting new batteries until the rolling code synchronises.

Whenever I do anything like this, I take the roof off first.

[lwt]

When you get the 2 halves apart, note which way up the batteries are. To get them out lift off the seemingly spare bit of green circuit board, again noting which way it sits (its job is just to keep the batteries in place). While its open check that the screw holding the silver key bit is tight. Mine resented first time.

[ChrisW500]

Many thanks for all the advice… all done very carefully and normal service is resumed! :-)

Chris