How long should a key battery last?

Tech and talk about the 991 and 992
Post Reply
User avatar
Tom
Site Admin
Posts: 8560
Joined: Fri Jun 25, 2021 2:04 pm
Location: Silicon Valley, CA
Has thanked: 890 times
Been thanked: 3840 times
Contact:
Contact Tom
I got a dash warning today that says my key battery is low and should be replaced. The car is about 1 year and 4k miles old. Normal? Is it a warranty item if dead so soon? Anyone know what battery it uses?

#1

Top
User avatar
audi4t
Posts: 473
Joined: Sat Jan 29, 2022 10:34 am
Location: Georgia / Connecticut
Has thanked: 385 times
Been thanked: 298 times
CR2032 3v button style

There are plenty of YouTube videos showing how to replace
2024 - 911 Carrera Coupe Arctic Grey (Aerokit)
2023 - 911 Cabriolet Shark Blue / Blue Top (Traded)
2022 - 911 Carrera Python Green (Traded)
2008 - BMW 135i Cabriolet Satin Yellow Vinyl Wrap / Black Top

#2

Top
User avatar
Hawk
Posts: 404
Joined: Wed Dec 15, 2021 4:14 am
Location: Florida
Has thanked: 131 times
Been thanked: 116 times
One year seems a rather short time for the battery life. The battery in my Macan with Comfort Access lasted for 3+ years before it needed replacement.

The battery life most likely depends on how often / long it communicates with the car. Do you leave the key in the garage near the car?
Last edited by Hawk on Fri Mar 11, 2022 12:04 am, edited 1 time in total.
Dick
2022 992 GT3 - Shark Blue, 6-speed manual, LWBs
2021 Cayenne GTS Coupe - Carmine Red / Houndstooth interior

#3

Top
User avatar
elm310
Posts: 283
Joined: Sat Feb 26, 2022 7:29 pm
Has thanked: 271 times
Been thanked: 92 times
I noticed that with comfort access the batteries work harder. So for my bimmers, they usually last about 3-4years. But that is not constant use though.
Eric
2022 911 Carrera 4 GTS
2009 BMW e92 M3
2014 BMW f10 535i
2017 Nissan Frontier SV
2019 Yamaha AR210 Jetboat

#4

Top
User avatar
Michaelx
Posts: 22
Joined: Sat Feb 26, 2022 10:24 pm
Has thanked: 15 times
Been thanked: 29 times
Mine lasted for 2 years (992 C4S) . But I‘m using (in app. 50%) also keyless-entry.

#5

Top
User avatar
Bluehighways
Posts: 36
Joined: Fri Dec 03, 2021 3:40 pm
Location: Southern California
Has thanked: 8 times
Been thanked: 30 times
You have got to keep the Key Fob fairly far away from the car when it's not in use. With my 992 parked in the garage and the Key Fob inside the house but in a room adjacent to the garage . . . . . 3 - 4 months. You absolutely have to keep them far enough apart so the car and the Key Fob can't be whispering to each other.

#6

Top
edirtaynine
Posts: 37
Joined: Sun Aug 01, 2021 5:52 pm
Has thanked: 16 times
Been thanked: 6 times
i replaced mine 2 yrs ago and so far its been ok since.
991.1 C2S

#7

Top
User avatar
tohendy
Posts: 31
Joined: Mon Jan 10, 2022 8:19 am
Location: Hilton Head Island, SC
Has thanked: 21 times
Been thanked: 2 times
Bluehighways wrote: Mon Mar 21, 2022 8:50 pm You have got to keep the Key Fob fairly far away from the car when it's not in use. With my 992 parked in the garage and the Key Fob inside the house but in a room adjacent to the garage . . . . . 3 - 4 months. You absolutely have to keep them far enough apart so the car and the Key Fob can't be whispering to each other.
Yeah, I just learned the hard way. Took delivery in early June and both are almost dead sitting inside the doorway! The nice thing is that my service manager said to bring them by and he would replace the batteries at no charge.
2022 Carrera S Cabriolet

#8

Top
User avatar
W5Hans
Posts: 65
Joined: Wed Feb 09, 2022 1:06 pm
Location: Netherlands
Has thanked: 63 times
Been thanked: 12 times
Contact:
Contact W5Hans
If you use the remote a lot to either close the convertible/windows it will use more energy and therefore last shorter.

#9

Top
User avatar
Tom
Site Admin
Posts: 8560
Joined: Fri Jun 25, 2021 2:04 pm
Location: Silicon Valley, CA
Has thanked: 890 times
Been thanked: 3840 times
Contact:
Contact Tom
If helpful to anyone, I ended up writing this DIY guide on replacing the battery.

https://www.carpokes.com/viewtopic.php?f=19&t=481

It's quite easy once you know how. Being lazy, this was quicker and easier than a drive to the dealer for me...

#10

Top
Post Reply