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MY16 GTI Keyfob battery type

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  • MY16 GTI Keyfob battery type

    (Couldn't find a thread which I thought I'd spotted with below info).

    Been getting the 'replace keyfob battery' message on the MFD for a few weeks now.

    Dealer quoted $8 for battery.

    How do you access the battery in the keyfob? Does it just pull apart like older ones did?

    What type of battery's needed & where's the best place to get one from? Jaycar?

    Thanks!
    MY16 MK7 Golf GTI
    - Manual - Sunroof - Folding Mirrors - Lock/Unlock Chirp - 4x Indicator Flash - Traffic - MK7.5 LED Tail Lights with Sweeping Indicators - Dynablink Sweeping mirror LEDs - White LED's on rear rego plate -

  • #2
    Id be curious as to why a car that's so new needs to have its battery changed already?

    You can use a thin object (like a 10c coin or similar) to pop open the battery compartment and it uses a CR2025 battery - although some people have reported that you can fit a larger (thicker) battery in there (CR2032) which will give a longer battery life. These are standard batteries you can get almost anywhere - including Jaycar but even the supermarkets and post offices have some of these batteries these days.

    2017 Ford Fiesta ST the go kart

    2015 Audi SQ5 bi-turbo V6 TDI family hauler

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    • #3
      It's just a standard CR2025 which you can pick up in lots of places.

      Just be careful that you're not getting the CR2032 (which is far more common), it's the same diameter so looks the same but it's thicker (2.5mm vs 3.2mm) and wont fit.

      edit: or it might according to Lucas post. If you want to test, the Apple TV remote uses CR2032 as does many other small remotes. If you have a 3D TV that uses active glasses lots of them use CR2025's too
      Last edited by The_Hawk; 09-06-2016, 04:21 PM.

      If it has an engine or heartbeat it's going to cost you.

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      • #4
        Usually about $5 for a 2 pack at Woolies
        2021 Kamiq LE 110 , Moon White, BV cameras F & B
        Mamba Ebike to replace Tiguan

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        • #5
          Thanks guys.

          Originally posted by Lucas_R View Post
          Id be curious as to why a car that's so new needs to have its battery changed already?
          I was wondering that too, though the car was picked up September last year, so ~8 months... Maybe washing the car with the Kessy key in pocket & constantly (accidentally) swiping the door handle did it!

          Oh that YT video's perfect. Cheers again.
          Last edited by Ralfi; 09-06-2016, 06:03 PM.
          MY16 MK7 Golf GTI
          - Manual - Sunroof - Folding Mirrors - Lock/Unlock Chirp - 4x Indicator Flash - Traffic - MK7.5 LED Tail Lights with Sweeping Indicators - Dynablink Sweeping mirror LEDs - White LED's on rear rego plate -

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          • #6

            CR2025 - Replaced mine last week. The original battery lasted about 8 months. I think it is because of the constant pinging with the car to see it it is still around. Because if the car is running and you take the key out..the system detects it. Got pack of 5 Maxcell for $4 delivered, Japanese made battery instead of the original Panasonic from Indonesia. Maxell CR2025 Button Coin Cell Lithium Battery 3V 5pcs Pack | eBay
            Attached Files
            Last edited by sillygogo; 09-06-2016, 09:17 PM.
            GOLF V GTI DSG Silver : On loan to parent until wife thinks I am a responsible driver
            GOLF VI 118TSi DSG Silver Leaf
            GOLF VII 110TSi DSG White
            GOLF VII GTI pp : on negotiation

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            • #7
              Up for replacement again (although this may have been for the spare keyfob... Can't remember). Anyway, this particular battery lasted 10 months.

              This time I tried a 2032. It wanted to spring out but after clipping the keyfob cover back on it seemed to squeeze into place without any issues.

              Looking at it from the side, the keyfob has a hairs-thickness raise on one side compared to my spare keyfob with a 2025 battery in there. I don't see it as an issue.

              Needed to re-sync the keyfob with the car after changing battery. Did this by inserting the key into the small hole under the drivers side door handle. That seemed to do the trick despite the manual saying the door handle cover needed to be removed before inserting the key into the lock & pressing/holding the unlock keyfob button. ��

              So I've got a PB of 10 months to beat....curious to see how the 2032 goes...
              MY16 MK7 Golf GTI
              - Manual - Sunroof - Folding Mirrors - Lock/Unlock Chirp - 4x Indicator Flash - Traffic - MK7.5 LED Tail Lights with Sweeping Indicators - Dynablink Sweeping mirror LEDs - White LED's on rear rego plate -

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              • #8
                I replaced a customer's one for the first time only a month ago.

                And that car was one of the first GTIs delivered, way back when.
                '07 Transporter 1.9 TDI
                '01 Beetle 2.0

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                • #9
                  Button battery 2025 v 2032 - what's the difference?

                  Hmm.... been reading the posts above and it begs the question of what is the difference between a 2025 button battery and a 2032 button battery?

                  Well... As already mentioned they both have the same diameter (20mm) and they both have the same voltage (3V) but the 2032 is 3.2 mm thick -therefore 7 mm thicker than the 2025's 2.5 mm housing.

                  It's this difference that is important because it means that the 2032 can accommodate more "stuff" internally which results in its greater electrical capacity. And the increased "stuff" that's packed into the battery means that the 2032 is physically heavier @ 3.2 grams versus the 2025's weight of 2.6 grams (not that this is important for the Key-fob application)

                  The capacity of the two batteries is nominally as follows (according to a couple of data-sheets that I managed to pull from the web):
                  • 2025 = 150 mAh (on continuous discharge at 20under 15kW load to 2.0V end-voltage)
                  • 2032 = 210 mAh (on continuous discharge at 20under 15kW load to 2.0V end-voltage)


                  This means that the 2032 packs an increased 180 mWatts of electrical power, which is 40% increase over then 2025

                  So, if the 2032 can physically fit into the fob - it will be my choice come time to change the battery,

                  Don

                  PS: Of course, the numbers above are only applicable to Brand-name button batteries
                  Last edited by DV52; 16-04-2017, 10:39 PM. Reason: recalculated % increase in capacity - thanks fontana302
                  Please don't PM to ask questions about coding, or vehicle repairs. The better place to deal with these matters is in the forum proper. That way you get the benefit of the wider expertise of other forum members! Thank you.

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                  • #10
                    ^Thanks heaps for the clarification, DV52.

                    Yeah I'd read up a while ago that the larger battery crammed more power & should theoretically last longer.

                    I'd forgotten I had a spare 2032 in the house, so instead of the 2025 I knew I had lying around which I'd originally planned to replace the flat battery with, I went with the big boy.

                    Here's that difference in keyfob casing I was referring to earlier....very, very slight raise of the battery compartment lid containing the 2032 on the right, compared to the 2025 on the left. Feels secure though.

                    Click image for larger version

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                    MY16 MK7 Golf GTI
                    - Manual - Sunroof - Folding Mirrors - Lock/Unlock Chirp - 4x Indicator Flash - Traffic - MK7.5 LED Tail Lights with Sweeping Indicators - Dynablink Sweeping mirror LEDs - White LED's on rear rego plate -

                    Comment


                    • #11
                      If the raised corner of the cap hooks in your pocket and breaks off it will cost a lot more than the correct battery. They are different for a reason, one being what you have found out.
                      2021 Kamiq LE 110 , Moon White, BV cameras F & B
                      Mamba Ebike to replace Tiguan

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                      • #12
                        I have installed a CR2032 and the battery cover is completely flat. In addition my fob sits inside a silicone sleeve for protection all the time so no risk of it catching anything.

                        Changing battery less frequently is the reason for using the larger capacity one.

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                        • #13
                          Looks more like 40% increase to me.

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                          • #14
                            Originally posted by DV52 View Post
                            Hmm.... been reading the posts above and it begs the question of what is the difference between a 2025 button battery and a 2032 button battery?

                            Well... As already mentioned they both have the same diameter (20mm) and they both have the same voltage (3V) but the 2032 is 3.2 mm thick -therefore 7 mm thicker than the 2025's 2.5 mm housing.

                            It's this difference that is important because it means that the 2032 can accommodate more "stuff" internally which results in its greater electrical capacity. And the increased "stuff" that's packed into the battery means that the 2032 is physically heavier @ 3.2 grams versus the 2025's weight of 2.6 grams (not that this is important for the Key-fob application)

                            The capacity of the two batteries is nominally as follows (according to a couple of data-sheets that I managed to pull from the web):
                            • 2025 = 150 mAh (on continuous discharge at 20under 15kW load to 2.0V end-voltage)
                            • 2032 = 210 mAh (on continuous discharge at 20under 15kW load to 2.0V end-voltage)


                            This means that the 2032 packs an increased 180 mWatts of electrical power, which is 90% increase over then 2025

                            So, if the 2032 can physically fit into the fob - it will be my choice come time to change the battery,

                            Don

                            PS: Of course, the numbers above are only applicable to Brand-name button batteries
                            210-150 =60 Which is 39.6% difference i would say
                            2021 Kamiq LE 110 , Moon White, BV cameras F & B
                            Mamba Ebike to replace Tiguan

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                            • #15
                              Originally posted by fontana302 View Post
                              Looks more like 40% increase to me.
                              Originally posted by Hillbilly View Post
                              210-150 =60 Which is 39.6% difference i would say
                              oops - math was never my strong suit!!!
                              Last edited by DV52; 16-04-2017, 10:38 PM.
                              Please don't PM to ask questions about coding, or vehicle repairs. The better place to deal with these matters is in the forum proper. That way you get the benefit of the wider expertise of other forum members! Thank you.

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