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#4745356 - 05/02/18 09:26 AM BMW Z3-Is this good CCA?
JaII Offline


Registered: 02/16/17
Posts: 5
Loc: Texas
2000 BMW Z3 2.5 location Dallas Texas
Battery has 650 CCA and 810 at 32F

Battery came from another car and it holds charge at 100%. What I am not sure about on this batt. is if its rated cranking amps are sufficient for this car-because obviously I would rather be above the required CCA. Living in Dallas-our 4 weather seasons are hot, hot, hot & hot. With a couple of days dipping to freezing. We don't use the car in those days-it's a weekender and mostly parked. Looking at this battery's CCA, is this suitable for this car?

Also living in a hot climate which CCA is determine will come into play at cranking the car - the 650CCA or the 810CCA at 32F?
What is the significance of each?



Here is the test from AZ




Edited by JaII (05/02/18 09:44 AM)

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#4745361 - 05/02/18 09:30 AM Re: BMW Z3-Is this good CCA? [Re: JaII]
Pelican Offline


Registered: 11/28/12
Posts: 196
Loc: Ajax,Ontario, Canada
For your weather 550 is going to be OK. I'd rather see CCA above 800, but for your use it's alright.

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#4745377 - 05/02/18 09:45 AM Re: BMW Z3-Is this good CCA? [Re: JaII]
Danno Offline


Registered: 10/07/12
Posts: 2048
Loc: Northern Ontario, Canada
You're fine with this battery for your use
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#4745411 - 05/02/18 10:42 AM Re: BMW Z3-Is this good CCA? [Re: JaII]
The Critic Offline


Registered: 08/30/04
Posts: 19922
Loc: CA
For BMW, the aH rating is the most important part. Not the CCA. Find out what the factory specified aH rating is for your configuration and make sure the replacement matches this.
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#4745414 - 05/02/18 10:47 AM Re: BMW Z3-Is this good CCA? [Re: JaII]
The Critic Offline


Registered: 08/30/04
Posts: 19922
Loc: CA
I just checked. Your application calls for BMW #61212353806 which is a group 48 with a 70aH rating.
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#4745424 - 05/02/18 10:54 AM Re: BMW Z3-Is this good CCA? [Re: The Critic]
mightymousetech Offline


Registered: 04/03/17
Posts: 1480
Loc: Ontario, Canada
Originally Posted By: The Critic
For BMW, the aH rating is the most important part. Not the CCA. Find out what the factory specified aH rating is for your configuration and make sure the replacement matches this.


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#4745481 - 05/02/18 12:17 PM Re: BMW Z3-Is this good CCA? [Re: JaII]
KMJ1992 Offline


Registered: 01/01/18
Posts: 100
Loc: Iowa, United States
Should be fine for the coming warm season, but i might get an oe or higher before winter. I always get the most CCA avaliable in whatever battery type it is when i replace a battery. I figure why not? If a few extra bucks gets me an extra year of life or keeps it cranking below zero better its worth it to me.

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#4745499 - 05/02/18 12:29 PM Re: BMW Z3-Is this good CCA? [Re: JaII]
user52165 Offline


Registered: 10/21/11
Posts: 1347
Loc: CA
I would be much concerned about proper venting of that sub floor trunk mounted battery than CCA. There have been "issues" with using an incorrect battery in that location......... issues like KABOOM!!!! upon start-up. Group 48 is vented - is yours?

BTW - those AZ battery/alternator testers are very marginal at best.


Edited by user52165 (05/02/18 12:56 PM)

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#4745548 - 05/02/18 01:36 PM Re: BMW Z3-Is this good CCA? [Re: JaII]
Olas Online   content


Registered: 12/11/13
Posts: 3973
Loc: Manchester, England
Batteries wear out quicker in hot weather than in cold, so the short duration of cooler weather you experience won't do a lot to slow the reaction rate.

650 is sufficient but as mentioned above 800 would be better - so long as all terminals are clean and tight and all your earthing is good then you should be ok but don't count on OE levels of longevity
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#4745582 - 05/02/18 02:14 PM Re: BMW Z3-Is this good CCA? [Re: KMJ1992]
y_p_w Offline


Registered: 05/06/05
Posts: 3650
Loc: SF Bay Area
Originally Posted By: KMJ1992
Should be fine for the coming warm season, but i might get an oe or higher before winter. I always get the most CCA avaliable in whatever battery type it is when i replace a battery. I figure why not? If a few extra bucks gets me an extra year of life or keeps it cranking below zero better its worth it to me.

With really hot weather, having high CCAs can be a compromise depending on how it got there. A larger battery producing more CCAs isn't necessarily bad. If they have thinner and more plates to achieve that, then it's going to be worse. The plates might warp or might not reform as well in high temps.

Few OEM batteries are high CCAs. I remember my Group 51/51R OEM batteries were all rated at 400 CCAs. The replacements I got ranged from 425 to 500 CCAs. I live in a mild climate so I prefer the lower ones for better longevity.

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#4745588 - 05/02/18 02:20 PM Re: BMW Z3-Is this good CCA? [Re: user52165]
mightymousetech Offline


Registered: 04/03/17
Posts: 1480
Loc: Ontario, Canada
Originally Posted By: user52165
I would be much concerned about proper venting of that sub floor trunk mounted battery than CCA. There have been "issues" with using an incorrect battery in that location......... issues like KABOOM!!!! upon start-up. Group 48 is vented - is yours?

BTW - those AZ battery/alternator testers are very marginal at best.


There was a Porsche driver killed recently by an overcharging battery venting to the inside of the car.

http://www.dailymail.co.uk/news/article-...ar-battery.html


Edited by mightymousetech (05/02/18 02:24 PM)
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#4745660 - 05/02/18 03:21 PM Re: BMW Z3-Is this good CCA? [Re: JaII]
Jett Rink Offline


Registered: 11/01/05
Posts: 369
Loc: Bristol, Tennessee
I realize that most motorists don't know anything about batteries, other than when they have a dead one the vehicle won't start. But it seems like the smell would have been pretty overpowering inside that Porsche. Wouldn't you roll down the windows or something to vent the odor in a situation like that?

They are kind of quick to blame the battery here, it may be the alternator overcharging that battery.
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#4745713 - 05/02/18 04:20 PM Re: BMW Z3-Is this good CCA? [Re: Jett Rink]
Egg_Head Offline


Registered: 10/07/12
Posts: 298
Loc: North Carolina
BMW's can be fussy about having the wrong type battery or even slight power variations with the proper one. Between that, the potential venting issues and having the car sitting for extended periods I'd spring for the proper group size. You may have zero issues.
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#4745715 - 05/02/18 04:24 PM Re: BMW Z3-Is this good CCA? [Re: JaII]
Carmudgeon Offline


Registered: 04/26/05
Posts: 568
Loc: Under the hood
Electrically, that battery is fine, more so in the Texas climate.

As mentioned, the OE battery for that car was a Douglas-made Group 48, spec'd at 70AH / 570A EN. BMW tends to favor reserve capacity over cranking amps, so an aftermarket battery like the DLG may not last as long.

Physically, the T5 is slightly smaller in height and length than a 48/H6, so it might have to be shimmed to fit securely, if the BMW cleat clamp isn't able to already accommodate it. (it looks like you've already done a test fit)

That style of JCI case has venting provisions on either end (in the one pictured, one vent opening adjacent to the UPC code is already closed off with the yellow plug), so it's just a matter choosing the right end and fitting the hose/swapping the plug.


Edited by Carmudgeon (05/02/18 04:30 PM)

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#4746037 - 05/02/18 08:53 PM Re: BMW Z3-Is this good CCA? [Re: The Critic]
brianl703 Offline


Registered: 05/07/04
Posts: 10597
Loc: Nokesville, VA
Originally Posted By: The Critic
For BMW, the aH rating is the most important part. Not the CCA. Find out what the factory specified aH rating is for your configuration and make sure the replacement matches this.


AH rating is irrelevant unless you're planning to deep-cycle the battery. In which case you should be using a deep-cycle battery, not a starting battery.

For a starting battery, CCA is the correct rating to use.

The only reason BMW specifies an AH rating is because that's how starting batteries are rated in Europe. For whatever reason, the more sensible measure of starting battery performance, the CCA rating, never caught on there.

For a given size, a deep-cycle battery will have a lower CCA and a higher AH rating than a starting battery, which will have a higher CCA rating and a lower AH rating.

Compare the specs on the following batteries and you'll see what I mean:

Group 24 automotive starting battery

Group 24 marine starting battery (has SAE and threaded terminals)

Group 24 marine "dual purpose" starting/deep cycle battery

Group 24 marine deep-cycle battery

CCA is determined by the surface area of the plates. AH is determined by the mass/weight of the plates.

A starting battery uses a more spongy lead that has higher surface area, but comparatively less weight/mass than the more solid lead used in deep-cycle batteries.

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