Author Topic: Mk8.5 gti key battery no warning!  (Read 4402 times)

Offline Watts

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Re: Mk8.5 gti key battery no warning!
« Reply #10 on: 20 February 2026, 14:50 »
Had the low battery message on mine today at 8 months old. Used to get 2 years plus on the 7.5!
2025 Oryx Black Edition Clubsport with Performance Pack.
Previously:
2019 Oryx 5dr TCR with Reifnitz.
2015 Tornado Red 3dr GTI PP, manual, Santiagos, Audi short shifter.

Offline Dav3smith

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Re: Mk8.5 gti key battery no warning!
« Reply #11 on: 20 February 2026, 14:53 »
I keep a spare battery in the glove compartment now. I had my key give up on me once. Never again. You'd be surprised (maybe not) the feeling of helplessness a dead key fob induces.
GTI Clubsport ED45 DBP, DCC, HK, WP, Pano

Gone Golf R 7.5
Gone GTI 7

Offline Watts

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Re: Mk8.5 gti key battery no warning!
« Reply #12 on: 20 February 2026, 15:13 »
I keep a spare battery in the glove compartment now. I had my key give up on me once. Never again. You'd be surprised (maybe not) the feeling of helplessness a dead key fob induces.

Had that too and agreed, it wasn't a great experience! Strange thing though was as I opened the car with the manual key, setting off the alarm which went for quite a while whilst I faffed about trying to stop it, not one person checked that I wasn't stealing it. Maybe they were VW owners too...

Got three spares now given how quickly they wear out.
2025 Oryx Black Edition Clubsport with Performance Pack.
Previously:
2019 Oryx 5dr TCR with Reifnitz.
2015 Tornado Red 3dr GTI PP, manual, Santiagos, Audi short shifter.

Offline Exonian

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Re: Mk8.5 gti key battery no warning!
« Reply #13 on: 20 February 2026, 15:19 »
Had the low battery message on mine today at 8 months old. Used to get 2 years plus on the 7.5!

Just checked the date of my last post here, 30th November. That’s when my warning came on.
Today is somewhere around 20th Feb and I’ve still not changed the battery and the warning is still illuminated. I do have a few spare batteries but decided to perform an experiment to see how long the battery takes to fully expire. I’d like to claim it’s because it’s not good (understatement) to throw perfectly serviceable batteries in the rubbish but it’s mostly because I just forget as soon as I park up and throw the keys in a drawer at home (in a faraday pouch)
‘25 8.5R, ‘23 8R, ‘20 8CS, ‘19 135iX, ‘19 TCR, ‘17 Ed40, ‘17 GTD, ‘15 7R, ‘13 GTI PP, ‘11 GTI, ‘09 GTI, ‘98 Ibiza Cupra, ‘05 GTI, ‘06 Polo GTI, ‘04 GT TDI, ‘05 Fabia vRS, ‘02 GTI T, ‘03 Ibiza TDI 130, ‘01 Leon 180, ‘89 mk2 16v, ‘99 Ibiza TDI, ‘96 VR6, ‘98 Ibiza TDI, ‘92 VR6, ‘88 mk2 8v, ‘92 Polo G40, ‘91 mk2 8v, ‘89 mk2 8v, 205 GTI 1.9, ‘83 mk1 GTI, ‘80 Scirocco GTI, plus some others I’ve forgotten 

Offline Watts

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Re: Mk8.5 gti key battery no warning!
« Reply #14 on: 20 February 2026, 15:39 »
Perhaps VW is sponsored by Panasonic batteries! Given the grief if they do suddenly give in, averagely happy to lose a couple of months for the peace of mind.
2025 Oryx Black Edition Clubsport with Performance Pack.
Previously:
2019 Oryx 5dr TCR with Reifnitz.
2015 Tornado Red 3dr GTI PP, manual, Santiagos, Audi short shifter.

Offline Ewankinch

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Re: Mk8.5 gti key battery no warning!
« Reply #15 on: 20 February 2026, 18:27 »
I had the low battery warning come on the other day on my 8.5 Gti. I changed the battery today with a Panasonic 2032. The fob then didn't work. I then fitted the old battery and it still didn't work so I again fitted the new one. The new one still wasn't working so after a while on Google trying various methods to sync the key nothing worked. The red light didn't work either if I pushed the lock and unlock button. I was then stumped. A while later I removed the new battery then refitted it and then it worked as it should. I don't understand what happened. The battery previously was fitted correctly 100%. I read on other forums etc some people had the same problem as me. Has anyone else experienced this??

Offline flipflops

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Re: Mk8.5 gti key battery no warning!
« Reply #16 on: 20 February 2026, 22:05 »
The 8.5 should charge your key battery in the middle cup holder, there's a little symbol on the bottom, pop it in there and I'm sure it charges, could be wrong tho :)

Offline Dav3smith

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Re: Mk8.5 gti key battery no warning!
« Reply #17 on: 20 February 2026, 22:25 »
The 8.5 should charge your key battery in the middle cup holder, there's a little symbol on the bottom, pop it in there and I'm sure it charges, could be wrong tho :)
I think you must have dreamt that, that is purely a symbol to show us plebs where to place the key when we are driving in case we don't want to keep it on our person as it doesn't have an ignition slot. There is no way to charge a non rechargeable battery inside the key by placing it on that symbol on the mat.
GTI Clubsport ED45 DBP, DCC, HK, WP, Pano

Gone Golf R 7.5
Gone GTI 7

Offline Watts

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Re: Mk8.5 gti key battery no warning!
« Reply #18 on: 20 February 2026, 22:28 »
The 8.5 should charge your key battery in the middle cup holder, there's a little symbol on the bottom, pop it in there and I'm sure it charges, could be wrong tho :)
I think you must have dreamt that, that is purely a symbol to show us plebs where to place the key when we are driving in case we don't want to keep it on our person as it doesn't have an ignition slot. There is no way to charge a non rechargeable battery inside the key by placing it on that symbol on the mat.

Agreed it is not for charging but I think it's where you have to put the key when the battery has expired to start the car. It used to be on the steering column in the position where you would insert the key in a non keyless car.
2025 Oryx Black Edition Clubsport with Performance Pack.
Previously:
2019 Oryx 5dr TCR with Reifnitz.
2015 Tornado Red 3dr GTI PP, manual, Santiagos, Audi short shifter.

Offline flipflops

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Re: Mk8.5 gti key battery no warning!
« Reply #19 on: 20 February 2026, 23:49 »
I think you’re right, as I was typing it it didn’t make sense to me, I’ll go stand in the corner and think about what I’ve done :)