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      06-25-2012, 06:25 PM   #1
doozyj
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Do I really need AGM Battery?

I need a new battery soon and was debating on getting the Mini Cooper (CSL) battery. Does anybody know about fitment with this on the Z4M.
The AGM battery will near $300 installed as I believe registering it with GT1 is required to maximize the life.

A Indie Mechanic that is very reputbable that I have gone to in the past said, that when installing a new battery, the new battery needs to be registered with a GT1. Is this absolutely required?

I am in Los Angeles and there is no cold weather issues.

Thanks in advance!
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      06-25-2012, 07:07 PM   #2
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My un-informed dealer stated that they don't know how to program it for a lither battery. There are several threads about batteries which work. If you can get it programmed for the battery, do it. Beedub fried his very expensive battery because the alternator overcharged it all the time. I've been running a Deka 11.5lbs battery with no issues for about 4 months now
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      06-25-2012, 07:23 PM   #3
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Just spend the $180 or so to buy a proper aftermarket battery. It's really not that bad for every 4-5 years or so...

No initialization is required via GT1 computer. Just plug & play. The problem with the Mini Cooper battery from what I remember (when I was doing research on what battery to get) is that it has less cranking amps and other specs inferior in comparison to OEM.

Here, I dug it up for you. This is what you can buy from your local auto parts store:
http://www.zpost.com/forums/showpost...6&postcount=47

Last edited by mfanatic325; 06-25-2012 at 07:46 PM..
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      06-25-2012, 07:26 PM   #4
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Quote:
Originally Posted by Roffle Waffle View Post
k. If you can get it programmed for the battery, do it. Beedub fried his very expensive battery because the alternator overcharged it all the time. ..".........
wow that would suck, IDK how I missed that post.
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      06-25-2012, 07:31 PM   #5
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Quote:
Originally Posted by doozyj View Post
I need a new battery soon and was debating on getting the Mini Cooper (CSL) battery. Does anybody know about fitment with this on the Z4M.
The AGM battery will near $300 installed as I believe registering it with GT1 is required to maximize the life. A Indie Mechanic that is very reputbable that I have gone to in the past said, that when installing a new battery, the new battery needs to be registered with a GT1. Is this absolutely required?

I am in Los Angeles and there is no cold weather issues.

Thanks in advance!
There is no registration process required or available for new battery installations for our cars. Anyone that tells you otherwise is just trying to milk a little more out of a battery sale. Our cars are based primarily on E46 technology and this was one of the last BMWs to not require battery registrations.
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      06-25-2012, 07:31 PM   #6
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He had the AMG Lithium battery, maybe because it was lithium..
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      06-25-2012, 07:35 PM   #7
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Here's the battery I installed, Deka is the manufacturer for the MUCH more expensive Braille batteries. In fact, this is just an unbranded one

http://www.zpost.com/forums/showpost...&postcount=582


mhughett thanks for the great info on programming
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      06-25-2012, 08:34 PM   #8
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Quote:
Originally Posted by mhughett View Post
There is no registration process required or available for new battery installations for our cars. Anyone that tells you otherwise is just trying to milk a little more out of a battery sale. Our cars are based primarily on E46 technology and this was one of the last BMWs to not require battery registrations.
This. Just bought myself this bad boy for about 90 after coupon. 3 minute install and viola! No programming no nothing. Please don't waste hard earned money at dealerships trying to feed you BS
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      06-25-2012, 09:18 PM   #9
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Quote:
Originally Posted by shakib View Post
This. Just bought myself this bad boy for about 90 after coupon. 3 minute install and viola! No programming no nothing. Please don't waste hard earned money at dealerships trying to feed you BS
Did the same thing last year with a comparible battery from O'Reilly.

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      06-25-2012, 10:34 PM   #10
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Quote:
Originally Posted by shakib View Post
This. Just bought myself this bad boy for about 90 after coupon. 3 minute install and viola! No programming no nothing. Please don't waste hard earned money at dealerships trying to feed you BS
41lbs. same weight as stock. screw that. Its also a lead acid battery, we're talking about AGM batteries
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      06-25-2012, 11:01 PM   #11
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I just put this in after finding that the previous owner installed the less expensive one that AutoZone lists, which is not the right size. We need H6, not H5.
Keep the vent nipple from the old battery. New one doesn't come with one.
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      06-25-2012, 11:14 PM   #12
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Quote:
Originally Posted by StickMon View Post
I just put this in after finding that the previous owner installed the less expensive one that AutoZone lists, which is not the right size. We need H6, not H5.
Keep the vent nipple from the old battery. New one doesn't come with one.
pretty sure thats not an AGM battery either, and its heavier than stock
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      06-25-2012, 11:22 PM   #13
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Description says "Duralast Platinum is an absorbed glass mat (AGM) battery ".
I'll grant you that it's a little heavy.

(But I only weigh 120#, so I've got some margin.)
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      06-26-2012, 02:42 AM   #14
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+1 on o'reilly 48 AGM, no need for coding and no issues. At some point I'll buy a lightweight lithium battery, but for now I have other mods to do first.
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      06-26-2012, 04:51 AM   #15
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i had a porsche GT3 battery and my car fried it to death :-( after a lenghly talk with eas it seems we MUST register the smaller batteries otherwise your car charges it like its the stock unit..... i have since moved back to the stock AGM battery......

that was a very expensive lesson. By the end the car wouldnt hold charge for a day, if you remember my pics i used to have the trickle charger on, on every photo!! lol
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      06-26-2012, 04:57 AM   #16
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As I Understand the atlernator has to be adjusted so the output voltage is considerable less than oem. Now I don't know if this is done through an alternator shop or via computer at the dealer. This maybe be referred as registered with the car. IDK
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      06-26-2012, 06:18 AM   #17
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Quote:
Originally Posted by Beedub View Post
i had a porsche GT3 battery and my car fried it to death :-( after a lenghly talk with eas it seems we MUST register the smaller batteries otherwise your car charges it like its the stock unit..... i have since moved back to the stock AGM battery......

that was a very expensive lesson. By the end the car wouldnt hold charge for a day, if you remember my pics i used to have the trickle charger on, on every photo!! lol
Oh man... I feel for you.
That sucks big time!

I've seen lots of other light weight battery conversions & I don't recall any of those guys mentioning registering them. strange

It does make sense though.
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      06-26-2012, 08:27 AM   #18
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Quote:
Originally Posted by Roffle Waffle View Post
pretty sure thats not an AGM battery either, and its heavier than stock
LA and AGM are about the same weight(as you saw in the other post the AGM weighed 44#s). There really isn't any significant advantage to AGM from my research. The parts stores offer both AGM and LA versions in the same shell and the AGM is usually 30-50% more $$$. CCA Ratings are similar and warranty is identical. I bought an O'Reilly LA battery and have had no issues.
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      06-26-2012, 08:38 AM   #19
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Quote:
Originally Posted by chickdr View Post
LA and AGM are about the same weight(as you saw in the other post the AGM weighed 44#s). There really isn't any significant advantage to AGM from my research. The parts stores offer both AGM and LA versions in the same shell and the AGM is usually 30-50% more $$$. CCA Ratings are similar and warranty is identical. I bought an O'Reilly LA battery and have had no issues.
This. I thought I was the only one who didn't see the fuss about about AGM batteries. If they have the same weight and same CCA being similarly reliable, I would be a fool not to take the cheaper one
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      06-26-2012, 09:35 AM   #20
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An AGM is a sealed battery and since it is IN the car with BMW's I would not think you would put in just any old FLA battery and have a high possability to make yourself sick.
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      06-26-2012, 10:03 AM   #21
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I thought Braille was always preferred ?
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      06-26-2012, 12:37 PM   #22
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Quote:
Originally Posted by davesz4mc
An AGM is a sealed battery and since it is IN the car with BMW's I would not think you would put in just any old FLA battery and have a high possability to make yourself sick.
Bingo. LA battery off-gassing is no joke
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