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Old 09-26-2011, 05:11 PM   #1
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2012 Wrangler Battery Group Change

All,

Usually when I buy a new vehicle I replace the battery from the junk the factory installs to something better. My choice is a Diehard Platinum. I've got one in my SVT Raptor and it's 930CCA and has never let me down on all the expeditions I've used that truck for so far.

I purchased a 2012 JKU (traded my 2010 GT500) and did some research on batteries for this rig and found that up until 2011 the factory used a Group 34 battery.

Went to Sears and picked up a dual terminal Group 34 and found out that it doesn't work (should have popped the hood to confirm the right battery)

Looks like Jeep changed battery groups from 34 to 91 for the new 2012.

I returned the Diehard Platinum and picked up an Interstate MTP-91

Stock battery is 600CA and 475CCA

Interstate MTP-91 is 875CA and 700CCA

The Diehard Group 34 (which doesn't fit and terminals are not oriented correctly) is 880CCA.

As you can see, the stock battery is fairly weak spec wise.


Hope this helps out anyone looking to junk the stock electrons for something better.

I'm installing the MTP-91 tonight so if that doesn't fit I'll report back.

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Old 09-26-2011, 05:17 PM   #2
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Never had a factory battery last less than three years but I live in a warm climate. If you live in the tundra then maybe I can understand throwing away a new battery.
After all how many amps does it take to turn over a 3.6l engine?
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Old 09-26-2011, 05:24 PM   #3
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Never had a factory battery last less than three years but I live in a warm climate. If you live in the tundra then maybe I can understand throwing away a new battery.
After all how many amps does it take to turn over a 3.6l engine?
Welcome to the forum.
Thanks.

I live in California and I off road whenever I can. Some of this can be an extended trip (e.g. Mojave Road @ 138 miles, primitive camping, bring your own gas, etc)

The last thing I want to worry about is some OEM crap battery going flat out in the middle of nowhere.

Since the Jeep has so many 12v connectors, an inverter, etc I would venture to guess that extended use of accessories could run the stock battery down fairly quickly. Add a winch and some high powered off road lighting and you see where I am going.

I didn't see too much room to install dual batteries and have no interest in that so tend to buy the largest capacity in stock size, easy to warranty (Interstate dealer and Sears are all over the place) batteries I can.
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Old 11-22-2011, 10:13 AM   #4
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Jeep really has their wrangler market well cared for. They know that many if not most wrangler owners take their Jeeps off road. They know that they add lights, Inverters, Winches and other power consuming accessories so what do they do? Shrink the battery. The battery holder on a Jeep should have room for a marine group 31 battery but they move in the opposite direction. I could care less if they spec the smallest usable battery but they should be able to accommodate a group 31 upgrade without modification; if they left no room for even a group 34 then they are hopeless. Honestly, I really like my Jeep (2004 TJ) but if the Land cruiser or Defenders were offered in the USA that is what I would have; especially if they were Diesel!
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Old 01-09-2012, 05:25 PM   #5
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Is it advisable to replace the 2012 stock battery if you have a winch, led off-road lights, and sub amp?
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Old 01-09-2012, 05:55 PM   #6
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Question

Quote:
Originally Posted by xjrguy View Post
All,

Usually when I buy a new vehicle I replace the battery from the junk the factory installs to something better. My choice is a Diehard Platinum. I've got one in my SVT Raptor and it's 930CCA and has never let me down on all the expeditions I've used that truck for so far.

I purchased a 2012 JKU (traded my 2010 GT500) and did some research on batteries for this rig and found that up until 2011 the factory used a Group 34 battery.

Went to Sears and picked up a dual terminal Group 34 and found out that it doesn't work (should have popped the hood to confirm the right battery)

Looks like Jeep changed battery groups from 34 to 91 for the new 2012.

I returned the Diehard Platinum and picked up an Interstate MTP-91

Stock battery is 600CA and 475CCA

Interstate MTP-91 is 875CA and 700CCA

The Diehard Group 34 (which doesn't fit and terminals are not oriented correctly) is 880CCA.

As you can see, the stock battery is fairly weak spec wise.


Hope this helps out anyone looking to junk the stock electrons for something better.

I'm installing the MTP-91 tonight so if that doesn't fit I'll report back.
-----------------------

Well did it fit You have me interested in a BETTER battery. Our VA Mtns are no place for battery-problems
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Old 01-09-2012, 06:07 PM   #7
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It's amazing how much junk there is in a Wrangler. The batteries are crap, the headlights are worthless, the tires stink, the wheels are ugly, the engine makes noise, the seats are uncomfortable, the dash is too pretty, the carpet is too plush, the transmission sucks, the radio is garbage. Makes one wonder why anyone buys a Jeep.
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Old 01-09-2012, 11:32 PM   #8
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-----------------------

Well did it fit You have me interested in a BETTER battery. Our VA Mtns are no place for battery-problems
Hi,

Yes the MTP-91 fit perfectly as its the same size as the stock 2012.

The interstate made a nice upgrade over the crap spec stocker.
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Old 01-10-2012, 06:11 AM   #9
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It's amazing how much junk there is in a Wrangler. The batteries are crap, the headlights are worthless, the tires stink, the wheels are ugly, the engine makes noise, the seats are uncomfortable, the dash is too pretty, the carpet is too plush, the transmission sucks, the radio is garbage. Makes one wonder why anyone buys a Jeep.
Wow, you're right. I'm getting rid of mine today.
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Old 01-10-2012, 04:35 PM   #10
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Wink Thanks for the reply.......

Quote:
Originally Posted by xjrguy View Post
Hi,

Yes the MTP-91 fit perfectly as its the same size as the stock 2012.

The interstate made a nice upgrade over the crap spec stocker.
---------------
Will be replacing mine SOON
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Old 01-10-2012, 05:25 PM   #11
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I think the Wrangler is just fine - trying to point out how so many people on these forums think everything is junk.
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Old 01-10-2012, 05:55 PM   #12
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Originally Posted by mikekeeper View Post
It's amazing how much junk there is in a Wrangler. The batteries are crap, the headlights are worthless, the tires stink, the wheels are ugly, the engine makes noise, the seats are uncomfortable, the dash is too pretty, the carpet is too plush, the transmission sucks, the radio is garbage. Makes one wonder why anyone buys a Jeep.
Because they are awesome.

Next question...
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Old 01-10-2012, 06:21 PM   #13
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I love my stock battery, stock tires, high dollar nav radio, stock wheels, my engine is so quite you can't tell it's running, 3.8 of course. Love the leather heated seats and the dash. Oh and the trany skid bar! I hatted the 3.73 gears which I swapped out and put a e locker in the front. Swapped out the headlite bulbs, threw on some mud flaps and it is pretty much good tp go. Also put hood wranglers on the hood and really cured the hood jumping once and for all. Left the hood spring out as I like it better this way as it is easier to latch the hood when it lays down flat. And my roof never leaks a drop as I leave it on like god and tebo intended! The reason they put a cheap little battery in the 12 models is to keep it light to help their fuel mileage. Not much luck with that so far. Time for some whiskey!
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Old 01-10-2012, 06:23 PM   #14
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I've always used, and will continue to use, Optima Red Top's in my vehicles. I use yellow tops in my boat for trolling motor bats. Motorguide 36v 105# trolling motor pulls a lot of juice and I can run for 16+ hours with the optima's.
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Old 01-10-2012, 06:25 PM   #15
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I love my stock battery, stock tires, high dollar nav radio, stock wheels, my engine is so quite you can't tell it's running, 3.8 of course. Love the leather heated seats and the dash. Oh and the trany skid bar! I hatted the 3.73 gears which I swapped out and put a e locker in the front. Swapped out the headlite bulbs, threw on some mud flaps and it is pretty much good tp go. Also put hood wranglers on the hood and really cured the hood jumping once and for all. Left the hood spring out as I like it better this way as it is easier to latch the hood when it lays down flat. And my roof never leaks a drop as I leave it on like god and tebo intended! The reason they put a cheap little battery in the 12 models is to keep it light to help their fuel mileage. Not much luck with that so far. Time for some whiskey!
I think this might be my favorite post yet.
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Old 04-25-2012, 04:17 PM   #16
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I've always used, and will continue to use, Optima Red Top's in my vehicles. I use yellow tops in my boat for trolling motor bats. Motorguide 36v 105# trolling motor pulls a lot of juice and I can run for 16+ hours with the optima's.
So what exactly is the difference between the red top and yellow top? I've heard some people recommend both, and one crazy friend recommend one of each w/ an automatic disconnect of sorts.. Kinda like what the benchmark-designs one does. As an electronics technician, I don't believe that would be hard for me to fabricate myself if needed.. However.. I'm not exactly knowledgable on what batteries are bad good better. Specs I can read all day. I need real-life results.
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Old 04-25-2012, 06:19 PM   #17
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Old 04-25-2012, 07:42 PM   #18
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I'm willing to bet that you could fit a larger group battery in there.

The battery box is 20% larger than the battery on all sides.
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Old 04-26-2012, 09:34 PM   #19
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Oh as an electronics technician/engineer, I very much can grok specs. But specs, sometimes, are quite misleading. Or talk about things that that sound flashy or needed, but in real-life applications, just aren't up to snuff. For example, the Optima Batteries *appear* to have the better specs compared to Odyssey ones... But why is it I constantly see and hear Odyssey and repackaged ones(die hard platinum) being recommended more/higher? Quality, in relation to specs, my friend. I've already found out what I needed about the red and yellow though, lol.
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Old 04-26-2012, 10:15 PM   #20
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Haven't heard grok in 20+ years.
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Old 04-27-2012, 03:39 AM   #21
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Haven't heard grok in 20+ years.
Anachronisms-R-us
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Old 04-27-2012, 03:42 AM   #22
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Oh as an electronics technician/engineer, I very much can grok specs. But specs, sometimes, are quite misleading. Or talk about things that that sound flashy or needed, but in real-life applications, just aren't up to snuff. For example, the Optima Batteries *appear* to have the better specs compared to Odyssey ones... But why is it I constantly see and hear Odyssey and repackaged ones(die hard platinum) being recommended more/higher? Quality, in relation to specs, my friend. I've already found out what I needed about the red and yellow though, lol.
You're an engineer. You'll figure it out.
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Old 04-27-2012, 08:08 AM   #23
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Here is what I did...

The battery pictured is an Optima Blue Top. Exact same specs as a Yellow top except it has the extra posts for my winch hook up. It is a deep cycle battery with 750 CCA and 120min reserve. I purchased it from Advance Auto Parts webside with a $50 off coupon code VISA. Optima is also offering a $25 rebate on all their batteries.
All I had to do to make it fit is pull the clips holding the pos and neg cables to obtain the extra 2-3" stretch. Battery sits in there secure.

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Old 04-27-2012, 11:22 AM   #24
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Renegade4x4,

How much was the "blue top" and why the blue versus the yellow top? I am going to get a new Optima this week.
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Old 04-27-2012, 12:18 PM   #25
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219 - 50 for the coupon code and 25 for rebate. So 145. I liked having the extra posts for hooking the winch up that's the only reason for the blue top. Other than that the batteries are identical.
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Old 04-28-2012, 12:10 PM   #26
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You're an engineer. You'll figure it out.
Lol. Well I understood the specs in a blink, haha. But the engineer in me would need to get ahold of a pair to fully test and come up with real world results and "benchmarks" of a sort. Unfortunately, I can't afford to just buy on a whim, and I'd need at least a month for a FULL list of tests, as well as disassembling to perform a UL equivalent quality test. I'm pretty sure Optima would be very unhappy to take the batteries back for a full refund then, lol. Perhaps I could get them to send me a test pair ;P if they did well, I'm sure my 4x4 group would recommend them. I know alot of us, me included, are looking to upgrade batteries and a several are looking for dual setups.
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Old 05-20-2012, 08:10 AM   #27
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Quote:
Originally Posted by Renegade4x4
Here is what I did...

The battery pictured is an Optima Blue Top. Exact same specs as a Yellow top except it has the extra posts for my winch hook up. It is a deep cycle battery with 750 CCA and 120min reserve. I purchased it from Advance Auto Parts webside with a $50 off coupon code VISA. Optima is also offering a $25 rebate on all their batteries.
All I had to do to make it fit is pull the clips holding the pos and neg cables to obtain the extra 2-3" stretch. Battery sits in there secure.
The yellow top comes in a dual terminal version also, the D34/78 this is the one I'm interested in. BTW how did you trick the website into allowing the blue top the only one that comes up for me is the red top.
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Old 05-20-2012, 09:25 AM   #28
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Because they are awesome.

Next question...
Dito, from me.

Go Jeep
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Old 06-26-2012, 12:28 AM   #29
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I thought you meant 'grep' anyway. I see redtops have sideposts too, but my understanding of the Optimas is that the yellow and blue tops have substantially better sustained power output, useful for winches and such.

So... which group battery is best for 12s? I'll be adding a winch in just a few days, so I'm planning on something with the extra posts but haven't picked anything yet. I want to stay with the stock battery box.
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Old 06-26-2012, 12:49 AM   #30
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I don't really see a problem to have a weak battery when 99% of the buyers will be fine with it. The other 1% will lift, change wheel and tires, add all kind of stuffs but complain about swapping the battery which is probably the easiest thing among all?

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