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Thread: AGM battery

  1. #1
    Z8 Novice
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    AGM battery

    Anyone using an AGM battery in their car? Any reason not to do so? Thanks in advance.

  2. #2
    I do know that one of our long departed owners used an Odyssey battery in his, primarily to save weight, but also for ease of use & service life, but he sold his car a while back, and not sure he'd had the battery in long enough so see a longevity advantage. I don't remember there being any issues with it.
    Andrew Macpherson

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  3. #3
    Z8 Ate My Homework! 2112's Avatar
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    I have used an Odyssey for the last 15 years.
    2000 Red over black
    heavily modified for performance. Although, not to the level of GM's car

  4. #4
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    Thanks for the input so far.

    By way of context, the impetus for the question was research on the use of AGM batteries in our cars, which among other things turned up this thread: http://www.bmwz8.us/forum/bmw-z8-cha...tion-4402.html Comments therein are contradictory regarding whether Z8s require "battery registration" or not, particularly after a switch in the type of battery (lead-acid to AGM). It appears that it is required (?) on later model cars, variously defined as post-2002 or post-2006, depending on the source.

    A few interesting tidbits as well... The thread mentioned above has a lengthy quote (from post #1), which is perhaps replicated from one or the other of these sites: https://munichmotorsport.com/service...-registration/ OR https://atlanticmotorcar.com/casestu...replacement-2/ They both specify that registration applies to BMWs beginning with the 2002 7-series.

    And, for those wishing to perform battery registration at home, at a discount from the dealership, this site offers that (for cars "after 2002" or "2002 or newer" depending on which statement on the site you believe): https://www.bimmer-tech.net/blog/ite...d-registration

    I'm seeking to replace my lead-acid battery with an AGM. To date, I've always used lead-acid with a battery tender. My car is driven infrequently, yet I'm soon to be on my 4th battery in 10 years, which seems ridiculous. I'm considering an AGM Interstate battery (https://www.interstatebatteries.com/...-bmw-z8-v850l#) and my tender/charger (https://www.amazon.com/dp/B00CD44RQO...roduct_details) set to AGM.

    Any additional thoughts and ideas are welcome. Thanks again.

  5. #5
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    I am a bit skeptical regarding battery ďregistration.Ē Please explain the rational for this service. Thanks

  6. #6
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    The relevant links in my previous post all explain the rationale for battery registration.

  7. #7
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    Thanks,I was too lazy to study it. My dealer did describe the rational for the battery registration but I donít quite buy into it.

  8. #8
    Z8 Ate My Homework! 2112's Avatar
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    This is the Odyssey I have been using since around 2005
       
    2000 Red over black
    heavily modified for performance. Although, not to the level of GM's car

  9. #9
    Z8 Ate My Homework! 2112's Avatar
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    I might switch to the 34R next time. Itís 10lbs heavier than the PC1200 but it has 300 more Cold Cranking Amps.

    https://www.4wheelparts.com/p/odysse...BX-34R-PC1500T

    the PC1200 seems to work fine but once in a while, I get the dreaded starter click. Maybe 10 extra pounds and 850 CCAís will prevent that? Plus, 49 lbs is still a lot lighter than the OEM lead acid battery.
    2000 Red over black
    heavily modified for performance. Although, not to the level of GM's car

  10. #10
    Z8 Ate My Homework! 2112's Avatar
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    I also have a 1500 Cold Cranking Amp lithium battery that I bought for my FGT but itís too tall. I might try that.

    Itís super lightweight at 22lbs.
       
    2000 Red over black
    heavily modified for performance. Although, not to the level of GM's car

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