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Old 03-08-2012, 06:54 AM   #1
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Size 34 battery or bigger

I've decided on mega tron plus from interstate . Yet is 34 the biggest that will fit in a stock tray ?
Or does size even matter ?
I'm future proofing for lights , sound .

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Old 03-08-2012, 07:29 AM   #2
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Size is just that ~ Physical Dimensions.
What you want to do is look at Cold Cranking Amps
and the Amp hour Rating.

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Old 03-08-2012, 08:22 AM   #3
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I figured they had diff capacities . Larger case sizes having higher .
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Old 03-08-2012, 08:29 AM   #4
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Quote:
Originally Posted by CoyoteOn2
Size is just that ~ Physical Dimensions.
What you want to do is look at Cold Cranking Amps
and the Amp hour Rating.
Yeah, and those bigger dimensions are directly related to CCA and amp hours. Obviously there's more to CCA than size, but generally the larger the battery of the same brand/model will have higher CCA and amp hours.
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Old 03-08-2012, 09:34 AM   #5
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Yes a Group 34 is the largest that will fit without modifications.
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Old 03-08-2012, 10:28 AM   #6
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Ty .
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Old 03-08-2012, 06:18 PM   #7
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Your profile says YJ so I can't say but in my '05 I put a group 24 in it. It is about 3/4"-1" taller than the 34 but just cleared the A/C lines. It is rated somewhat higher in CCAs. Do some measuring & make sure the terminal posts are in the correct places.
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Old 03-08-2012, 08:59 PM   #8
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Ya I sold it and bought a 99 4.0 .
Can't update sig on iPhone .
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Old 03-08-2012, 09:34 PM   #9
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Quote:
Originally Posted by Jerry Bransford View Post
Yes a Group 34 is the largest that will fit without modifications.
you can fit a Group 31 with minimal work.

http://www.jeepforum.com/forum/f9/fo...ot-lie-906538/

it's a whole lot more battery than most folks would need tho.

For comparison:
Sears Diehard Platinum P4 (Group 34) = 880 CCA, 135 min reserve, 53 lbs
Sears Diehard Platinum 31M (Group 31) = 1150 CCA, 205 min reserve, 75 lbs
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Old 03-08-2012, 09:42 PM   #10
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Quote:
Originally Posted by UnlimitedLJ04 View Post
you can fit a Group 31 with minimal work.
It's not "minimal work" if you have A/C as most have.
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Old 03-09-2012, 09:38 AM   #11
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Quote:
Originally Posted by freeskier View Post
Yeah, and those bigger dimensions are directly related to CCA and amp hours. Obviously there's more to CCA than size, but generally the larger the battery of the same brand/model will have higher CCA and amp hours.
GEE, my bad! I hadn't realized he was asking about Batteries of the
"same brand/model" as you refer.
So my comment was geared more towards the Quality of a Battery in
a particular Group Size, for example: OPTIMA Red Top is rated @ 800
CCA at 0*, verses DIE HARD Platinum @ 880 CCA @ 0*, verses the DIE
HARD Gold, that is only rated at 640 CCA @ 0*. To me that's a big
difference between 640 and 880. IF my math is correct, that's around
a 240 CCA difference between two Batteries of the same physical
dimensions, with the last two being of the same Brand, but of course,
not the Same Model.
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Old 03-09-2012, 09:44 AM   #12
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The OP said he already decided on the mega tron plus interstate battery and he was asking about size.
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Old 03-09-2012, 10:01 AM   #13
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Copy That, as I stated, my Bad.
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Old 03-10-2012, 11:22 AM   #14
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It's all good guys . I only learn by asking and reading other posts .

Ty all for the comments
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Old 03-10-2012, 01:03 PM   #15
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COSTCO 34 is 1000amp 795CCA and $79.95.

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