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Old 01-18-2011, 09:43 PM   #1
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dual batteries

so im thinking about the future upgrades to my jeep and all the lights and winch and stuff im thinking a dual battery set up might be a good thing to have, first off is it needed, and will i need anything else other then the dual bat kit

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Old 01-18-2011, 09:50 PM   #2
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you'd be better off with one big, good battery (Sears Diehard Platinum) and hi-amp alternator.

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Old 01-18-2011, 09:53 PM   #3
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Old 01-19-2011, 09:57 AM   #4
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ok that sounds easyer on the wallet as well what is the stock alternater producing
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Old 01-19-2011, 10:07 AM   #5
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I disagree, two is always better than one. Wrangler power products used to make a nice dual tray. You can either wire it through an isolator or without.
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Old 01-19-2011, 01:13 PM   #6
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Dual battery setups are sweet, but you do need to use an isolator to really get the benefits. Otherwise they'll perform just like one big battery.
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Old 01-19-2011, 02:31 PM   #7
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Yes and no, I never isolate mine....I wanna have full crankability and current draw if I need it
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Old 01-19-2011, 04:07 PM   #8
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"I don't have nor do I feel the need for a dual battery system. My single battery has always been enough for me even with lots of winching. If I had unlimited $$$ I'd have one but it's never been an issue that would make it more important than other upgrades I've done. ....

Sears Diehard Platinum 34/78-DT which is an AGM (absorbed glass mat) battery that is the ideal battery type for surviving the jolts & vibrations of offroading. Plus it is ideal for winching. Odyssey makes the Diehard Platinum for Sears.

My Jeep turns over faster & stronger with the Diehard Platinum than it ever did with any of my three previous three Optimas...

The only issue with directly connecting batteries like that without any electrical isolation between them (diodes) is that the batteries must be identical and they must be of the same age and condition. If one is weak, it will always be placing a load on the other battery.

However, installing a battery isolator rated to the amperage capacity of the alternator (113-117 amps usually) between them would be a good idea even if the batteries are identical at this point....

Your alternator is fine, I wouldn't worry about beefing it up. My Jeep had its OE alternator and a Diehard Platinum 3478DT the day it was stolen. "

^^ all that is by Jerry Bransford, who IMO has a lot of experience.....

http://www.wranglerforum.com/f5/dang...elp-43761.html

http://www.wranglerforum.com/f5/opti...ned-46752.html
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Old 01-19-2011, 04:08 PM   #9
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Quote:
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Yes and no, I never isolate mine....I wanna have full crankability and current draw if I need it
So, you'd rather drain both batteries and not be able to start your rig with either?
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Old 01-19-2011, 04:45 PM   #10
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So, you'd rather drain both batteries and not be able to start your rig with either?
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Old 01-19-2011, 04:54 PM   #11
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No matter what you decide, if you go custom you can get supplies from a marine store. They make great connectors and switches for dual battery setups. Very common on boats... And its still a basic 12v system so all of the components will work the same with car batteries. The difference really is that the marine batteries are deep cycle meaning they do not offer as much voltage in a spike but they retain it longer (like a wheelchair or golf cart battery would).

Sometimes I've seen a winch isolated to its own battery as well. You need to remember to switch over to the winch battery and charge it now and again. All you need for this is another set of battery cables, a double throw switch and somewhere to put 'em!
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Old 01-19-2011, 04:55 PM   #12
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Very few have a true need for a dual battery setup. I have a single heavy duty battery and the stock 117 amp alternator and it works fine even when I do a lot of winching. I winched 6-7 Jeeps in a row up an obstacle last saturday without problem. I have even had to which myself off the trail several times without my engine running and still never had a battery problem. All it takes is a little common sense and good battery management to avoid the need for dual batteries or a bigger alternator.
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Old 01-19-2011, 05:22 PM   #13
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I have dual batteries but not because of the usual reasons. I carry a suitcase type Ready Welder - it needs 24 volts to operate. I fabbed a small tray that mounts just ahead of the regular battery - I put a small 12 volt lawnmower tractor battery on it. Hooking it in series with the regular battery gives me the 24 volts for the welder - I just have to move cables around.

It's small, so it fits well, runs the welder fine, and alone it's powerful enough to emergency start the engine. My winch and everything else runs on the regular battery so the small battery never gets drained.

But -- in case the regular one dies, I still have that as a back-up by switching cables again. (Sort of a self jump start.)

Twice now I've pulled it out and carried it up a hill to emergency weld somebody where I couldn't get my rig close to them. (That plus theirs gives the 24 volts) - I like the fact it's light weight!

I never bothered with a charging splitter - whenever I have the hood open I toss a 110 volt charger on it. Maybe someday.
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Old 01-19-2011, 05:30 PM   #14
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I was mearly stating my opinion. One that I have formulated over my 37+ years in the automotive electronics field. I have had stereo systems that alone would draw close to 800 amps continuous so I am very well versed in the need for ample current. For my purposes I will always run dual batteries in my jeep for the simple fact that a single one like I run in my crawler will not fit under the hood of a jeep. On every vehicle I own I have dual batteries and high current alternators, I don't leave anything electrical to chance...after all its what I do for a living and I wouldn't want my stuff not working or blowing up To me its just like horsepower, I'd rather have way more on reserve than I need, but its always there when you push the pedal.
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Old 02-14-2014, 06:15 PM   #15
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Where to put dual batteries?

I was looking at pulling dual batteries in my 2008 Rubicon (4-door), but in looking under the hood there didn't seem to be room. Where would one place the second battery and are things going to need to be moved to do it? I'm not to savvy under the hood, but have friends to help, but any under the hood pics would be appreciated.
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Old 02-17-2014, 08:47 PM   #16
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Interstate Batteries make a new 4yr Free replacement AGM High Performance Battery. Its a bit spendy, but has plenty of reserve capacity to run your wench and lights.
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Old 03-04-2014, 10:35 PM   #17
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Are the AGM batteries similar to the old Optima in that they can be mounted in any direction? Even on their sides?
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Old 03-04-2014, 10:44 PM   #18
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Only ones I have found that are not vented are the optimas. Been overly researching battery's lately. If you can keep it upright diehard platinum are made in Missouri. Optimas can be mounted upside down if you want and I have had great luck with them but they are not made here if that matters to you.

Edit. Found this looks like platinum can go on side. Not sure about interstate. It has a valve of some sort.

Here is the press release for Sears/Enersys.
EnerSys Signs Multi-Year Contract to Provide Sears Holdings With Long-Life DieHard(R) Platinum BatteriesREADING, Pa. and HOFFMAN ESTATES, Ill., Feb. 27 /PRNewswire-FirstCall/ -- EnerSys (NYSE: ENS), the world's largest manufacturer, marketer and distributor of industrial batteries, today announced it has signed a multi- year contract with Sears Holdings (Nasdaq: SHLD) to manufacture and supply Sears with a newly categorized DieHard Platinum branded battery for aftermarket automotive and marine applications. DieHard is America's most preferred automotive battery, among those stating a preference.
Beginning in March, 2007, Sears Auto Centers will be the exclusive distribution channel for DieHard Platinum batteries. "By working with EnerSys on the new DieHard Platinum battery, we continue the legacy of innovation that was established with the original DieHard battery 40 years ago," said Rick Sawyer, vice president/general merchandise manager of Sears Auto Centers. "We're confident this new battery will live up to the DieHard brand name and that users will be pleased with its performance. These premium-grade batteries are designed for a longer life than traditional batteries, offer increased levels of safe operation, can withstand extreme heat and cold, and are durable for consumer automotive/marine applications. The DieHard Platinum battery will offer proven vibration resistance to the consumer market.
The new DieHard Platinum batteries have up to 28% more Cold Cranking Amps (CCA) than comparatively sized spiral Absorbed Glass Mat (AGM) batteries providing much more starting power to automobiles and boats, along with unmatched reserved capacity. These thin-plate pure-lead batteries will carry DieHard batteries' best-ever, free replacement warranty. See your local Sears store for written warranty details.
"We're thrilled to provide this high-end, durable DieHard Platinum version to consumers," said John Craig, chairman, president and chief executive officer of EnerSys. "This partnership represents a great opportunity for more users to benefit from our pure-lead technology products."
The DieHard Platinum batteries are manufactured in EnerSys' U.S. manufacturing facility in Warrensburg, Mo, where the first DieHard Platinum came off the production line today. They have a valve-regulated design that allows them to be installed in any orientation, except inverted, without spilling and the U.S. Department of Transportation has classified them as non- spillable for safe shipping.
For more information, contact Richard Zuidema, Executive Vice President, EnerSys, P.O. Box 14145, Reading, PA 19612-4145. Tel: 800/538-3627; Web site: EnerSys Home.
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Old 03-04-2014, 10:58 PM   #19
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Are the AGM batteries similar to the old Optima in that they can be mounted in any direction? Even on their sides?
Optima batteries are pure AGM as are other AGM batteries like the Diehard Platinum, Odyssey, and Exide Orbital which can all be mounted on their side. For example, the US Dept. of Transportation considers them sealed, non-spillable, and safe for shipping.
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Old 03-04-2014, 11:22 PM   #20
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Cool! Thanks for the answers. I only ask because most of the dual battery kits I've seen say that they'll only fit optima batteries on their side and I've heard bad things about Optimus lately
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Old 03-04-2014, 11:32 PM   #21
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While side mounting might not matter size might still. Not sure how big the others are compared to optima. I'd measure before buying if you can't find it listed.
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Old 03-05-2014, 10:27 AM   #22
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People that go with duel batteries more often then not fall into the group that have too much money and not enough brain power.

They are very expensive and not needed.
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Old 03-05-2014, 12:06 PM   #23
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People that go with duel batteries more often then not fall into the group that have too much money and not enough brain power.

They are very expensive and not needed.
X2. I have even had to winch my TJ off the trail on battery power alone so those behind me could keep going when my engine couldn't be started. The engine started right up without needing a jump start after I fixed the problem.

Of course that wasn't a long difficult pull on battery power alone but it just goes to show our battery power isn't on the ragged edge like some think.

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