My car is just over 3 years old . It doesn’t get used much so I decided to take it out to the shops today as it was snowing. A warning came up say the the key batter was low . I managed to get the the shops and back . Once home I thought I would try the wives key .. dead as a dodo . Obviously I need 2 new batteries, my question is , will my wives key still remember the code fore the car ? I’ve no idea how long the battery has been dead for. Do it now ! Your a long time dead !!

CR2032 is the batteries that you need. Without knowing how long its been dead for it’s a tricky question just remember when swapping the key with some juice in it to replace the battery as quickly as you can once the flat one is removed. MY14 Kahn Converted Dynamic - Fuji White Ebony/Pimento Interior
MY15 Xenon Headlight Conversion

MY17 RRS SVR - Estoril Blue Cirrus/Ebony 🪣💺’s

I thought the batteries where recharged whilst driving?

If you have the older style dock key in dash then they charge whilst driving! The battery is soldered in and they will also need replaced eventually. MY14 Kahn Converted Dynamic - Fuji White Ebony/Pimento Interior
MY15 Xenon Headlight Conversion

MY17 RRS SVR - Estoril Blue Cirrus/Ebony 🪣💺’s

All good guys , thanks for the info . Went to Morrisons and got a pack of 2 Duracell for £5 , wife gave me a £5 voucher so they cost nothing.
Changed both remotes batteries, both sets of keys work  Do it now ! Your a long time dead !!

Purplemadboy wrote:

My car is just over 3 years old . It doesn’t get used much so I decided to take it out to the shops today as it was snowing. A warning came up say the the key batter was low . I managed to get the the shops and back . Once home I thought I would try the wives key .. dead as a dodo . Obviously I need 2 new batteries, my question is , will my wives key still remember the code fore the car ? I’ve no idea how long the battery has been dead for.

It is considered good practice to regularly swap between your 2 sets of keys to avoid any possible issues that can occur if a set of keys are not used in a while. On the odd occasion the spare keys are not recognised by the vehicle and although you can unlock it, it will remain immobilised and fail to start. This issue can occur with any make/model of vehicle that has a factory fitted immobiliser.

Sound advice Dondiddy for keys that dock and are recharged - not sure for later models with "smart" keys that don't require docking. Perhaps someone could comment. MY 09 GS manual in Lago Grey, Wood Co arm rest and side bumper strips - now sold.

MY 15 SD4 SE Auto Orkney Grey with colour coded Bumper Door Mouldings

The later keys will unlock the car if there is enough juice. If the battery is flat and will not unlock it takes about 2 minutes to change the battery for a new one (once you know how to do it). Once in the car you will get the fob battery low message if it requires changing.

So in summary, on the new type key, if it will not open, change battery, if you get a message, change battery.

The situation of opening the car but not being able to start does not seem to happen, you get the battery low message but that is way before the battery is completely flat. FL2 Metropolis, Loire Blue, ebony/ivory