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Thread: About those key batteries...

  1. #1
    Team Z8 Satch's Avatar
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    About those key batteries...

    I seem to have dying (or dead) batteries in the ignition keys. One, which had not been used for quite some time (maybe years) by the previous owner, seems to be beyond recovery; at any rate, using that key in an attempt to charge it brought it back enough after a thirteen-hour day that it had enough juice to lock the car, but not enough to unlock it the next morning---after I had already locked the other key in the trunk!

    Fortunately, I remembered that you can use the key as, you know, a KEY... .

    From the looks of these keys and their tiny screws, they were meant to be taken apart, and therefore one ought to be able to replace the batteries, nicht wahr? But with Radio Shack gone, where do we get the batteries?

  2. #2
    Batteries Plus ?

    http://www.batteriesplus.com
    Skip Hammerman

    2002 BMW Z8 - Meisterschaft GT, PP installed, CDV delete
    2013 BMW X3
    2015 Porsche 911 Targa 4S

  3. #3
    Also maybe try your local BMW dealer, as I think it is some kind of ni-cad unit that isn't generally available.
    Andrew Macpherson

    Expert Z8 Inspections, with full support for both Z8 sale and purchases.

  4. #4
    in Coral Gables, Florida DirkZ8's Avatar
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    The question is "Where to get a battery?". My advice: Rather than prying it open and potentially creating a mess with a delicate part loaded with electronics, send the key to a specialist.


    http://www.bmwgm5.com/key_repair.htm

    http://www.bmwgm5.com/keys.htm



    There's lots of other free advice out there on the internet. You know what they say about free advice ...

    https://www.youtube.com/watch?v=kC68Z7CP2XM
    Dirk

    Alpina #142
    www.bmwccca.com

  5. #5
    Team Z8 Satch's Avatar
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    Okay, I ordered a couple of batteries (51218201226) from Prestige Motorwerks (http://parts.prestigebmw.com/cart.aspx). Apparently E52 keys are quite similar to X5 keys, which would make sense, since they were launched at about the same time... at the end of June, I should be able to say how it went!

  6. #6
    DSC Off Gammaman's Avatar
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    Satch, if you google that number, 51218201226, it comes up as an ordinary CR 2025 lithium watch battery. Is that what you got?
    61345 ​Jet Black/Sport Red

  7. #7
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    I'm pretty sure the keys don't come part, if they're anything like my M5 keys.

    The metal plate on the back can be unscrewed, but that only takes off the plate. They key is still glued together on the side.

    People have successfully cut open the M5 key and replaced the battery, but you have to be very careful to keep the key looking clean.

    I wonder if a replacement from BMW comes with the back "Z8" plate, I doubt they'll have the numbered ones for Alpina models.

  8. #8
    Z8 Addict Z8doc's Avatar
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    Quote Originally Posted by BMWM5er View Post
    I wonder if a replacement from BMW comes with the back "Z8" plate, I doubt they'll have the numbered ones for Alpina models.
    Yes, just got a key from BMW for the Z8 -- it has the Aluminum Back Plate embossed with a Z8.

    You have to then program the car to the key so as to get it to recognize the frequency. Listed elsewhere in the forum for instruction.

    I suggest you check with Alpina regarding the replacement for any Alpina versions and since they have a special back plate too.
    Best Regards,

    Jeff
    61995 Silver /// Rot - Original Owner
    Z8 Club of Germany e.V. #102