Had car three months (though second owner) and already have a low battery for key fob warning message come on when ignition is turned. 

 

Can anyone tell me if I replace this myself will I somehow have to reconfigure its relationship to the car or will it work as normal automatically? My biggest worry is I replace it and then I can't get into the car at all because it needs to be re-setup.

 

My Octavia doesn't have any lock on the outside to get in even if it did go, so car would be locked nmw.

Did mine a week ago. Pop the side off the key, new battery in, job done. Works fine. I made sure I had the spare key with me just in case.

1 hour ago, zenith707 said:

My Octavia doesn't have any lock on the outside to get in even if it did go, so car would be locked nmw.

Rear lock is under the right part of the door handle, which you remove by popping from the bottom up.

Would also recommend you use a good brand of battery, Duracell, Energizer etc as these tend to last longer. change the battery and then go to the car an use it and it wont lose any sync settings. 

 

1 hour ago, toni8b said:

Rear lock is under the right part of the door handle, which you remove by popping from the bottom up.

 

If you look underneath the drivers door handle, there is slot in it which you can put the end of your key in an twist it (careful of the paintwork) and off will pop a plastic cover. There will be a lock under that to open the car with the key if the battery fails to unlock remotely. The user manual has a picture of this in the "locking and unlocking sections" if you have it? 

 

 

If you replace battery as soon as sign coms up, you have no problem. 

Is yours KESSY (keyless entry), if so mine would some times eat batteries in literally 2 months and thats using decent batteries. 

 

I did wonder if leaving car unlocked caused the key fob battery to drain quicker (as if being unlocked it was waiting for car to be started so was looking for the key signal) as mine is in a locked alarmed garage so didnt always lock it, but then when I started locking it the fob battery lasted longer.

I think it's about two years since mine started complaining about the key battery. I've bought a replacement, but so far it's still running fine on the original (5 year old) battery.

Replace the battery in the spare key as well. Otherwise the warning doesn't go away in my experience.

On 28/10/2020 at 19:06, zenith707 said:

Had car three months (though second owner) and already have a low battery for key fob warning message come on when ignition is turned. 

 

Can anyone tell me if I replace this myself will I somehow have to reconfigure its relationship to the car or will it work as normal automatically? My biggest worry is I replace it and then I can't get into the car at all because it needs to be re-setup.

 

My Octavia doesn't have any lock on the outside to get in even if it did go, so car would be locked nmw.

Replace the standard 2025 battery with a 2032. It's slightly thicker but does fit and lasts longer than a 2025.

Yes I've used the 2032s.

Two in a year. ⚡

My key fob battery is only a year old and has had very little use.  The car still picks up the signal from the fob when 50 yards away.  Can someone tell me how I cancel the warning?

 

Thank you

Stewart