[t0nyyyy]

Hello, I heard that Display key's battery performance is low. I want to know that does display key works like a normal key? Without screen. is it possible? can i use just only buttons to unlock/lock my bmw not screen. How about battery? if I use only buttons not screen?

[FerasMF]

My car is 530i LCI. The display key battery will last for 2-3 weeks if charged fully. But i rarely turn on the screen. I just use it like the (old) key fob pressing buttons to lock/unlock most of the time. It will still work as such even when the battery is fully discharged. I think your key will display a notification when your car is connected to charger and that might consume the key battery and you might need to charge the key more often. But as I said my key fob still works to lock/unlock (and recognise my driver profile) even when its battery is fully discharged.

[t0nyyyy]

Originally Posted by FerasMF

My car is 530i LCI. The display key battery will last for 2-3 weeks if charged fully. But i rarely turn on the screen. I just use it like the (old) key fob pressing buttons to lock/unlock most of the time. It will still work as such even when the battery is fully discharged. I think your key will display a notification when your car is connected to charger and that might consume the key battery and you might need to charge the key more often. But as I said my key fob still works to lock/unlock (and recognise my driver profile) even when its battery is fully discharged.

That is What I want to know. Thank you very much.

[eric_gm]

The display key has two batteries. A long life battery that functions just like your other remotes and the battery that powers the display and all the smart features.

As a smart key it lasts a couple of weeks or so, depending on how often you turn the screen on.

As a regular keyless fob, it will last years. It doesn't matter if the other battery is depleted, it will still work as a regular key and will be recognized by the car.

[t0nyyyy]

Originally Posted by eric_gm

The display key has two batteries. A long life battery that functions just like your other remotes and the battery that powers the display and all the smart features.

As a smart key it lasts a couple of weeks or so, depending on how often you turn the screen on.

As a regular keyless fob, it will last years. It doesn't matter if the other battery is depleted, it will still work as a regular key and will be recognized by the car.

I'm happy to hear that info. Appreciate that

[Jemster68]

Originally Posted by eric_gm

The display key has two batteries. A long life battery that functions just like your other remotes and the battery that powers the display and all the smart features.

As a smart key it lasts a couple of weeks or so, depending on how often you turn the screen on.

As a regular keyless fob, it will last years. It doesn't matter if the other battery is depleted, it will still work as a regular key and will be recognized by the car.

This has interested me. I never use the display key as the lousy battery life concerned me. So having read this, I thought I’d grab mine, last used a few months ago, and try to unlock the car. And it doesn’t work. I guarantee if I charge it, it will work ok.

I then thought I’d look for info on how to change the 2nd battery, but anything I found seems to only refer to the single rechargeable battery. Have you any more info on this? Has LCI a different display key from pre-LCI perhaps? Can the 2nd battery be changed?

[eric_gm]

Did you try unlocking via the display key buttons or by grabbing the door handle with the key in your pocket (if you have comfort access)?

I am 100% sure my key works via comfort access even if the main battery is depleted. But I admit I have taken mine apart and I haven't seen this secondary battery that I see referred in some places. My guess is that uses some residual charge from the main battery to keep some basic functions active? Or there is indeed a secondary battery that somehow I didn't see and in your case it also failed?

Here are some mentions of these 2 batteries inside, so you see I'm not a madman:

https://g05.bimmerpost.com/forums/sh....php?t=1693129
https://g05.bimmerpost.com/forums/sh....php?t=1777462
https://g07.bimmerpost.com/forums/sh....php?t=1953268

[Gautam]

Originally Posted by Jemster68

This has interested me. I never use the display key as the lousy battery life concerned me. So having read this, I thought I’d grab mine, last used a few months ago, and try to unlock the car. And it doesn’t work. I guarantee if I charge it, it will work ok.

I then thought I’d look for info on how to change the 2nd battery, but anything I found seems to only refer to the single rechargeable battery. Have you any more info on this? Has LCI a different display key from pre-LCI perhaps? Can the 2nd battery be changed?

Originally Posted by eric_gm

Did you try unlocking via the display key buttons or by grabbing the door handle with the key in your pocket (if you have comfort access)?

I am 100% sure my key works via comfort access even if the main battery is depleted. But I admit I have taken mine apart and I haven't seen this secondary battery that I see referred in some places. My guess is that uses some residual charge from the main battery to keep some basic functions active? Or there is indeed a secondary battery that somehow I didn't see and in your case it also failed?

Here are some mentions of these 2 batteries inside, so you see I'm not a madman:

https://g05.bimmerpost.com/forums/sh....php?t=1693129
https://g05.bimmerpost.com/forums/sh....php?t=1777462
https://g07.bimmerpost.com/forums/sh....php?t=1953268

I encountered what eric_gm stated. My first display key was defective and couldn't hold a charge (on the "main" battery) and still functioned fine with comfort access for a couple of months.

[Jemster68]

Originally Posted by eric_gm

Did you try unlocking via the display key buttons or by grabbing the door handle with the key in your pocket (if you have comfort access)?

I am 100% sure my key works via comfort access even if the main battery is depleted. But I admit I have taken mine apart and I haven't seen this secondary battery that I see referred in some places. My guess is that uses some residual charge from the main battery to keep some basic functions active? Or there is indeed a secondary battery that somehow I didn't see and in your case it also failed?

Here are some mentions of these 2 batteries inside, so you see I'm not a madman:

https://g05.bimmerpost.com/forums/sh....php?t=1693129
https://g05.bimmerpost.com/forums/sh....php?t=1777462
https://g07.bimmerpost.com/forums/sh....php?t=1953268

Yeah, when you mentioned it earlier, I did search it out and did find it mentioned on threads so not questioning your sanity, but I couldn't find any info on changing it and YouTube vids didn't seem to show anything aside from the single rechargeable battery.

I admit I didn't go try out the comfort access, I simply used the buttons. Assuming if there was a battery like the regular keys, it would still be usable. I'll give the comfort a go tonight, maybe that is the... err... key.

I'd like it to work, the Display Key does look kinda cool, but it has sat in a drawer since getting the car as the first time I charged it, it died within a week. Judging by the condition of the key, the previous owner did the same thing as it hasn't a mark on it.

[Jemster68]

Ok, just tested out Comfort Access and nope. Nothing. Dead as a very dead thing.

I might charge it and see how long it’ll work for as an experiment. I certainly wouldn’t be trusting it though - imagine going on holiday for a couple of weeks and coming back to an unlockable car in an airport car park. Not my idea of fun.