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post #1 of 30 (permalink) Old 10-01-2009, 11:56 PM Thread Starter
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Battery questions

Does it damage anything if I run two different sized batteries in the truck, like one with 900 CCA and one with 600 CCA?
Also looking at Optima's, should I be looking at the red tops or the yellow tops? Any idea's on who has the best pricing? Thanks

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post #2 of 30 (permalink) Old 10-02-2009, 12:14 AM
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Re: Battery questions

You should run batteries of the same size.

If you do it, make sure the larger one is on the starter side (ie: passenger side). If the smaller one is over there then you will fry it quickly.

Oh and don't expect either battery to last as long cause of the mis-match in draw and charge.

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post #3 of 30 (permalink) Old 10-02-2009, 12:14 AM
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Re: Battery questions

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Originally Posted by cota View Post
Does it damage anything if I run two different sized batteries in the truck, like one with 900 CCA and one with 600 CCA?
Also looking at Optima's, should I be looking at the red tops or the yellow tops? Any idea's on who has the best pricing? Thanks
Won't matter to the truck how may combined amps are available. But when you replace one battery you should replace them both. Why you would buy two different batts?? Unless you already have a new one sitting around.

Lots of guys run the yellow tops.

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post #4 of 30 (permalink) Old 10-02-2009, 12:34 AM Thread Starter
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Re: Battery questions

Just trying to make some extra room on the driver side. Thanks

2000,CC,4x4,auto
some bolt on stuff from Bean & BTS
Some used and some home made stuff
463hp/991tq 10/01/05 mustang dyno 10k rollers
458hp/923tq 04/14/07 dynojet dyno
490hp/1025tq 03/08/08 mustang dyno 10k rollers
03/08/08 1st runs ever, 13.5 & 13.264 @ 100.65mph screwing up both launches, 7600#'s, #2 only
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post #5 of 30 (permalink) Old 10-02-2009, 01:34 AM
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Re: Battery questions

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Does it damage anything if I run two different sized batteries in the truck, like one with 900 CCA and one with 600 CCA?
Also looking at Optima's, should I be looking at the red tops or the yellow tops? Any idea's on who has the best pricing? Thanks
You will be replacing batteries often. Go with one big one, or remote mount 2 of the same size

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post #6 of 30 (permalink) Old 10-02-2009, 02:06 AM
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Re: Battery questions

Quote:
Originally Posted by cota View Post
Does it damage anything if I run two different sized batteries in the truck, like one with 900 CCA and one with 600 CCA?
Also looking at Optima's, should I be looking at the red tops or the yellow tops? Any idea's on who has the best pricing? Thanks
Ive never had two batteries in my truck yet that were the same

So no it doesnt seem to matter. Same with my tractors.

As for the optima's you want the blue top ones failing that then the yellow top ones and last choice is the red's.

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post #7 of 30 (permalink) Old 10-05-2009, 08:50 PM
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Re: Battery questions

Shouldn't matter. My guess...The cranking amps (and other battery specs) are what the battery can supply. It's a chemical reaction. And I don't think anyone can ruin the chemical reaction by asking the battery for more amps than it can react to create.

Worse case scenario is the small battery will discharge quicker than the other battery. You will then have an issue where you need to charge the smaller battery longer, but the larger battery for less time. This may cause the larger battery to be overcharged, and may reducing it's life or boil out some water. What I don't know is how much overcharging a battery can take. It might not be a big deal. And it is possible a simple stock alternator is always overcharging the batteries anyways.

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post #8 of 30 (permalink) Old 10-06-2009, 12:18 AM
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Re: Battery questions

Yellow top.

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post #9 of 30 (permalink) Old 10-06-2009, 01:12 AM
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Re: Battery questions

I would do a little research on the interweb about the Optimas quality issues. A buddy of mine just had a problem with his. His brother had an optima going for 6 years, so he bought one, its dead 8 months after install. I installed Diehard Platinums which are made by Oddessy battery, started my truck on one battery easily today!

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post #10 of 30 (permalink) Old 10-06-2009, 01:31 AM
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Re: Battery questions

there was a thread a while back about yellow versus red if you search optima red vs yellow there is a bunch of threads with many diff. aspects to look at

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