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#4607960 - 12/19/17 08:20 AM Auto Battery Criteria
Gebo Offline


Registered: 09/18/02
Posts: 2154
Loc: VA
I used to always judge a battery's quality by the amount of "CCA". The higher the "CCA" the better the battery. But I realize you need a high "RC" as well. Well, the other day I was informed that you can't have the best of both because going for the highest CCA will inhibit how high you can get the RC. And going for a really high RC would limit how high you can get the CCA. So raising one has an inverse effect on the other? I pondered....

The conclusion I took away from that conversation was that the key is to find the sweet spot balance between the highest CCA and the highest RC.

Is this malarky? Just trying to learn.
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#4607976 - 12/19/17 08:43 AM Re: Auto Battery Criteria [Re: Gebo]
WyrTwister Offline


Registered: 01/13/13
Posts: 1586
Loc: Texas
You are way beyond me . I buy a battery of the same " frame size " as OEM and 4 to 5 year warranty . ( I realize the warranty is largely a joke , unless the battery fails early . )

And shop by price .

Battery failed to start , on the work truck I drive , yesterday . Walmart battery . Installed January 2013 . Found out it had been on the shelf about 2 years ! :-)

It was a 5 year battery , I think . If not , a 4 year battery . Received less than $ 2 credit on the old battery .

I do not live in the extreme cold north . The temperatures often exceed 100F in the summer .

Best of luck to you , :-)
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Wyr
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#4607988 - 12/19/17 08:53 AM Re: Auto Battery Criteria [Re: Gebo]
Claud Offline


Registered: 02/11/14
Posts: 593
Loc: Margate England
If you don't have enough CCA to reliably start the engine then no amount of reserve capacity will be any use to you.

Claud

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#4608003 - 12/19/17 09:12 AM Re: Auto Battery Criteria [Re: Gebo]
bullwinkle Offline


Registered: 10/09/04
Posts: 7744
Loc: Cincinnati, OH, USA
Originally Posted By: Gebo
I used to always judge a battery's quality by the amount of "CCA". The higher the "CCA" the better the battery. But I realize you need a high "RC" as well. Well, the other day I was informed that you can't have the best of both because going for the highest CCA will inhibit how high you can get the RC. And going for a really high RC would limit how high you can get the CCA. So raising one has an inverse effect on the other? I pondered....

The conclusion I took away from that conversation was that the key is to find the sweet spot balance between the highest CCA and the highest RC.

Is this malarky? Just trying to learn.
Believe higher CCA is related to plate thickness, and RC is more for deep cycle batteries. Plate disintegration seems to be the common failure on my starting batteries, but I haven't had a deep cycle fail that way yet.
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#4608004 - 12/19/17 09:12 AM Re: Auto Battery Criteria [Re: Gebo]
mechjames Online   content


Registered: 01/16/08
Posts: 518
Loc: Richmond, BC, Canada
You can have the best of both.
High CCA and High Reserve.
http://www.odysseybattery.com/

I have 10 years on a PC1750 and 8 years on a PC1500. Both are still maxing out my load tester past 1000cca every time I check em.
Expecting 15 to 20 year lifespan.


Edited by mechjames (12/19/17 09:13 AM)
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#4608008 - 12/19/17 09:13 AM Re: Auto Battery Criteria [Re: Gebo]
blupupher Offline


Registered: 08/27/04
Posts: 4492
Loc: Katy, Republic of Texas
CCA is the short high energy burst a battery can give for starting below -18C.
RC is how long the battery will last with a small load on it (25amps @ 25C till voltage drops below 10.5v).

It has to do to the number and thickness of plates inside the battery.
For higher CCA, manufactures put in more lead plates, but they are thinner. This gives the really high CCA, but at the cost of reserve capacity. It is also bad for battery life if you are in high heat areas. This is why many companies will sell a "northern" battery and a "southern" battery. The northern batteries have higher CCA, but a little lower RC.

If you really want to understand batteries better, go to www.batteryuniversity.com. More infor there than most need, but it is some really good reading.
THIS PAGE talks about plate thickness and how it works.
_________________________
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#4608026 - 12/19/17 09:33 AM Re: Auto Battery Criteria [Re: Gebo]
CT8 Offline


Registered: 10/09/14
Posts: 11245
Loc: Idaho
The quality and how much material is in the battery will determine CCA and RC. To put is simply.
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#4608043 - 12/19/17 09:47 AM Re: Auto Battery Criteria [Re: Gebo]
mrsilv04 Offline


Registered: 12/08/06
Posts: 8301
Loc: Illinois
When I can buy dual terminal group 78 batteries with a 5 year warranty, for less than $50... I don't tend to sweat the details.

https://www.ruralking.com/battery-650-cca-34-78-dt.html

I dropped one in a Ford V10 motorhome (because just about anything would fit in the tray). It sat ignored, all winter in an unheated tool shed, in northern Illinois (late November to early May).

Even after 5 1/2 months, and that amount of cold... without a Battery Tender or anything... that V10 cranked over and roared to life like it had been running the day before.

I'm putting these in everything that I can, while the price lasts.
_________________________
2004 Silverado - on its 3rd Jasper engine in less than one year.

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#4608058 - 12/19/17 10:00 AM Re: Auto Battery Criteria [Re: mechjames]
bbhero Offline


Registered: 03/20/15
Posts: 4746
Loc: Virginia
Great point mechjames. You can have the best of both but it will cost you a fair amount of money. X2 batteries made by Northstar run around $270. High CCA and high RC. 5 yr free replacement warranty. With use of a good battery charger these will last a very long time as well.
_________________________
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"Treat your family like your friends and treat your friends like your family."

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#4608111 - 12/19/17 10:39 AM Re: Auto Battery Criteria [Re: Gebo]
EdwardC Offline


Registered: 11/14/13
Posts: 1890
Loc: Chicago, IL
Another option is to use a larger battery than was originally installed, preferably one on the low end of CCA for the same size. That way, because it's larger, it'll have plenty of RC. And because the CCA is on the lower end (and still higher than the original batter), the plates are (hopefully) thicker and sturdier.

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#4608131 - 12/19/17 11:02 AM Re: Auto Battery Criteria [Re: Gebo]
Kev994 Offline


Registered: 08/18/16
Posts: 19
Loc: North Carolina
Get a battery at Costco. 42 month no question warranty. After 3 years get it tested, if it fails return it for a full refund and buy a new one.

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#4608143 - 12/19/17 11:12 AM Re: Auto Battery Criteria [Re: Gebo]
BrocLuno Offline


Registered: 09/06/15
Posts: 5625
Loc: Kalifornia Kollective
I've got a Costco battery in the Bronco going on 10 years. Works fine smile

Sometimes you get lucky. Only buy batteries from stores with high turn-over ...
_________________________
Formerly in marine engineering. In an earlier life I owned my own petroleum tank truck, and hauled for the majors and independent's.

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#4608145 - 12/19/17 11:14 AM Re: Auto Battery Criteria [Re: Gebo]
expat Offline


Registered: 05/12/09
Posts: 5400
Loc: Canada
Does size matter? If you can fit a physicly larger batter from a different group (all other things being equal) would it be likely to last longer?

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#4608183 - 12/19/17 11:45 AM Re: Auto Battery Criteria [Re: Gebo]
doitmyself Offline


Registered: 06/03/02
Posts: 6276
Loc: MI
This is a good thread. I, too, question at what point "bigger is better" CCA in the same dimensioned case becomes detrimental to battery life. I.E., higher CCA = thinner plates. North vs. south conditions surely must matter also.

In my case, my OEM battery is only 525CCA and it has started our small 4 cyl./few accessories car reliably even below 0F the past 5 winters. Will jumping to the next capacity of 640CCA reduce battery life noticeably due to thinner plates? Does bigger impede charging efficiency?

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#4608319 - 12/19/17 01:50 PM Re: Auto Battery Criteria [Re: mrsilv04]
SatinSilver Offline


Registered: 01/24/08
Posts: 10342
Loc: OH
Originally Posted By: mrsilv04
When I can buy dual terminal group 78 batteries with a 5 year warranty, for less than $50... I don't tend to sweat the details.

https://www.ruralking.com/battery-650-cca-34-78-dt.html

I dropped one in a Ford V10 motorhome (because just about anything would fit in the tray). It sat ignored, all winter in an unheated tool shed, in northern Illinois (late November to early May).

Even after 5 1/2 months, and that amount of cold... without a Battery Tender or anything... that V10 cranked over and roared to life like it had been running the day before.

I'm putting these in everything that I can, while the price lasts.


+1, to the Exide batteries they use. Over five years on the one in the Matrix all for around $50 installed and still tests fine. Plus they now come with a longer warranty versus when I bought one. There's now a 2 year full replacement warranty on it. Plus their AGM battery is $129 for a Group 35. But I think they start right around $119 for some other sizes.

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