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BMW Z3-Is this good CCA? #4745356
05/02/18 09:26 AM
05/02/18 09:26 AM
Joined: Feb 2017
Posts: 5
Texas
JaII Offline OP
JaII  Offline OP
Joined: Feb 2017
Posts: 5
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



Last edited by JaII; 05/02/18 09:44 AM.
Re: BMW Z3-Is this good CCA? [Re: JaII] #4745361
05/02/18 09:30 AM
05/02/18 09:30 AM
Joined: Nov 2012
Posts: 301
Ajax,Ontario, Canada
Pelican Offline
Pelican  Offline
Joined: Nov 2012
Posts: 301
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.

Re: BMW Z3-Is this good CCA? [Re: JaII] #4745377
05/02/18 09:45 AM
05/02/18 09:45 AM
Joined: Oct 2012
Posts: 2,170
Northern Ontario, Canada
Danno Offline
Danno  Offline
Joined: Oct 2012
Posts: 2,170
Northern Ontario, Canada
You're fine with this battery for your use


2016 Sorento SX V6 AWD
2015 KIA RIO SX
2010 Mazda 3 2.0L
2009 Venza V6 AWD
2013 Sonata 2.4L RIP in write-off crash
Re: BMW Z3-Is this good CCA? [Re: JaII] #4745411
05/02/18 10:42 AM
05/02/18 10:42 AM
Joined: Aug 2004
Posts: 20,032
CA
The Critic Offline
The Critic  Offline
Joined: Aug 2004
Posts: 20,032
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.


2011 Toyota Prius - 173k - Various 0W-20 (Brew)
2007 Honda Accord 2.4 - 131K - Mobil 1 EP HM 5W-30
Re: BMW Z3-Is this good CCA? [Re: JaII] #4745414
05/02/18 10:47 AM
05/02/18 10:47 AM
Joined: Aug 2004
Posts: 20,032
CA
The Critic Offline
The Critic  Offline
Joined: Aug 2004
Posts: 20,032
CA
I just checked. Your application calls for BMW #61212353806 which is a group 48 with a 70aH rating.


2011 Toyota Prius - 173k - Various 0W-20 (Brew)
2007 Honda Accord 2.4 - 131K - Mobil 1 EP HM 5W-30
Re: BMW Z3-Is this good CCA? [Re: The Critic] #4745424
05/02/18 10:54 AM
05/02/18 10:54 AM
Joined: Apr 2017
Posts: 1,481
Ontario, Canada
mightymousetech Offline
mightymousetech  Offline
Joined: Apr 2017
Posts: 1,481
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.


thumbsup


Mighty Mouse Tech
BMW Tech, Former Acura Tech
2010 Civic Si Castrol 0W40, Redline MTL
2013 BMW 135i M Sport Edition Castrol 0W40, Redline MTL
Re: BMW Z3-Is this good CCA? [Re: JaII] #4745481
05/02/18 12:17 PM
05/02/18 12:17 PM
Joined: Jan 2018
Posts: 101
Iowa, United States
KMJ1992 Offline
KMJ1992  Offline
Joined: Jan 2018
Posts: 101
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.

Re: BMW Z3-Is this good CCA? [Re: JaII] #4745499
05/02/18 12:29 PM
05/02/18 12:29 PM
Joined: Oct 2011
Posts: 1,406
CA
user52165 Offline
user52165  Offline
Joined: Oct 2011
Posts: 1,406
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.

Last edited by user52165; 05/02/18 12:56 PM.
Re: BMW Z3-Is this good CCA? [Re: JaII] #4745548
05/02/18 01:36 PM
05/02/18 01:36 PM
Joined: Dec 2013
Posts: 3,989
Manchester, England
Olas Offline
Olas  Offline
Joined: Dec 2013
Posts: 3,989
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


Cable ties should hold it
Re: BMW Z3-Is this good CCA? [Re: KMJ1992] #4745582
05/02/18 02:14 PM
05/02/18 02:14 PM
Joined: May 2005
Posts: 3,650
SF Bay Area
y_p_w Offline
y_p_w  Offline
Joined: May 2005
Posts: 3,650
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.

Re: BMW Z3-Is this good CCA? [Re: user52165] #4745588
05/02/18 02:20 PM
05/02/18 02:20 PM
Joined: Apr 2017
Posts: 1,481
Ontario, Canada
mightymousetech Offline
mightymousetech  Offline
Joined: Apr 2017
Posts: 1,481
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

Last edited by mightymousetech; 05/02/18 02:24 PM.

Mighty Mouse Tech
BMW Tech, Former Acura Tech
2010 Civic Si Castrol 0W40, Redline MTL
2013 BMW 135i M Sport Edition Castrol 0W40, Redline MTL
Re: BMW Z3-Is this good CCA? [Re: JaII] #4745660
05/02/18 03:21 PM
05/02/18 03:21 PM
Joined: Nov 2005
Posts: 369
Bristol, Tennessee
Jett Rink Offline
Jett Rink  Offline
Joined: Nov 2005
Posts: 369
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.


1987 Mercedes 300E 87,000 miles 15w-40
2012 Honda Odyssey 120,000 miles 0w-20
2000 Mercedes CLK320 170,000 miles 0w-40
Re: BMW Z3-Is this good CCA? [Re: Jett Rink] #4745713
05/02/18 04:20 PM
05/02/18 04:20 PM
Joined: Oct 2012
Posts: 311
North Carolina
Egg_Head Offline
Egg_Head  Offline
Joined: Oct 2012
Posts: 311
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.


1979 Garelli Rally Sport
2009 Cub Cadet LT1042
2002 BMW 540 M Sport (totaled)
Re: BMW Z3-Is this good CCA? [Re: JaII] #4745715
05/02/18 04:24 PM
05/02/18 04:24 PM
Joined: Apr 2005
Posts: 588
Under the hood
Carmudgeon Offline
Carmudgeon  Offline
Joined: Apr 2005
Posts: 588
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.

Last edited by Carmudgeon; 05/02/18 04:30 PM.
Re: BMW Z3-Is this good CCA? [Re: The Critic] #4746037
05/02/18 08:53 PM
05/02/18 08:53 PM
Joined: May 2004
Posts: 10,597
Nokesville, VA
brianl703 Offline
brianl703  Offline
Joined: May 2004
Posts: 10,597
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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