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Old 02-07-2011, 07:05 PM   #1
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duel batteries?

who has it? is it worth it? how did you do it? leaving a resturant a guy asked me to jump his truck, i think ok no prob. athough it was a diesel, id still be there trying to jump a diesel with no luck at all, i know this from trying before. but on the way home it brought up the question haveing duel batteries.

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Old 02-07-2011, 07:19 PM   #2
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Few of us here need or would benefit from dual (not duel) batteries. I can see the benefit if you plan on doing something that will drain a battery but so far, in 15 years of wheeling my TJ, with a LOT of winching and even winching several times without the engine running, I've yet to drain my battery. Proper battery management is all you need to do. I carry jumper cables which would be enough should I ever drain my battery, since I never wheel alone.

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Old 02-07-2011, 07:19 PM   #3
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I believe you mean dual batteries but dueling batteries might be fun. Of you are pushing a lot of amps for winch, air compressor, way too loud sounds, or lighting up the night with 60 high beams I really can't see that you would need them. I have a winch and 12v viair compressor that I use a bunch and one sears platinum battery works great.
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Old 02-07-2011, 07:24 PM   #4
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yeah "dual" i was at hooters couldnt help but have a beer or 2. just a typo
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Old 02-07-2011, 07:33 PM   #5
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Yep I'd be thinking duals too if I had just been to Hooters.
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Old 02-07-2011, 07:37 PM   #6
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I've had to jump a lot of stuff. Some with 2, 3, and 4 batteries. 12 to 24 volts, and it can be a bunch of sparks, if not a duel
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Old 02-07-2011, 08:38 PM   #7
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Old 02-07-2011, 09:16 PM   #8
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I plan on running dual batteries in the future. I would rather be safe than sorry with auxiliary lighting and winching draws these days. You never know!
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Old 02-07-2011, 09:38 PM   #9
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To the O.P. - something to consider

I highly doubt the weak link in your Jump-start attempt was your vehicle, or more specifically your vehicle's battery. Having quite a bit of experience with helping people get their car with a dead battery started, I've found that most often the weakest link in the equation is the jumper cables themselves. Lots of times the cables can look real thick, but once you look at the actual gauge of the wire inside the super thick sheathing, its pathetically small.

Once i realized this i made myself a set of jumper cables out of some true 4 gauge (car stereo amplifier) wire. I also tried to make sure they weren't any longer than they had to be - they are only about 8 feet long. These things have worked brilliantly every time i have ever used them, and they start anything, immediately, regardless of the charge in the old battery.
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Old 02-07-2011, 10:39 PM   #10
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Speaking of battery jumper cables, I got screwed by a too-good-to-be-true internet price on what was advertised as 4 gauge (a pretty big gauge) jumper cables. I bought three sets for my wife, son, and I since my old Craftsman set of 4 gauge jumpers was about worn out. I received them and was pleased to see the large diameter cables appeared to be the diameter of 4 gauge wiring as was advertised.

Then I was asked to give a jump start to a fellow Jeeper and I pulled out my brand-new set of jumper cables and connected 'em up. I was barely able to get the the Jeep's engine to crank and his engine wouldn't start at all. A buddy tried his jumper cables and it started right up. I was like, WTF. Then I looked at the copper wire itself in my jumper cables and I discovered it was tiny stuff, more like 8-10 gauge under all that insulation that only made them look like 4 gauge wiring. I threw out all three of those cheap-*** jumper cable sets, they were a complete rip-off.

Buyer beware, Caveat Emptor.
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Old 02-07-2011, 10:52 PM   #11
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Come to think of it, I'm not sure i've ever even seen a set of GOOD jumper cables, other than the ones i built myself. I'm sure they exist...

Make sure you look at the amount of actual wire inside the sheathing, which you can usually see inside the handle of either clamp.
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Old 02-07-2011, 11:46 PM   #12
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The setup I did back in '06.
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Old 02-08-2011, 12:33 AM   #13
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At 12 volts the insulation doesn't have to be super thick - that's fraud!

I carry jumpers I made in all my vehicles - I used multi-strand wire so they'd be flexible, with regular insulation. They are probably heavier wire than most "store bought" cables - 10 Gauge! Being small and flexible they don't take much room. They store almost anywhere.

They are only for emergencies - not for common everyday use. The only thing is they won't pass enough current if the battery is completely dead. I let it charge the dead battery for a minute or two.

Yes, they take a little time, but when you are stuck, who cares? It's still better than walking. And they are not bulky.
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Old 02-08-2011, 12:44 AM   #14
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A simple yet effective system is often used on motorhomes -
It's a solenoid that connects the positive cables together whenever the ignition switch is on. It has to be a solenoid made for continuous duty - made for that - available at camper suppliers.

Key off they are isolated, key on they are in parallel, so they both get charged and you have double cranking power. If you want to keep one in standby while winching, simply deactivate the solenoid.

I think they are about $12.
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Old 02-08-2011, 01:06 AM   #15
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Rather than invest in a duelin' battery set-up, why not get something like this: 3-in-1 Jump-Start/Air Compressor

I'm planning to get something like this, because 1) it is good in emergencies, and 2) when I go out prospecting, I can power my gold-gettin' equipment with it. The one drawback I see is that it's another piece of equipment to lug around, but I'm wondering if there might be a place to stow it securely under the hood.
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Old 02-08-2011, 10:43 PM   #16
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i was interested also in having dual battery setup, but both dealer and expert workshop dedicated to Jeep said there is no place under the hood of a JK2011 2D. Will have to look into a portable jump start kit for emergencies.

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