I wanted to second the recommendation of Odyssey batteries. I'll have to do some measuring and see if two of their mid-size units would fit in the stock location. Both should surpass the OE specs.

 

The diagram is showing two 6volt batteries connected in series. Thats 12 volts, lots of cranking power, not as much storage. This would work but I don't think its needed. If you need two batteries use two 12 volt batteries connected in parallel( positive to positive, negative to negative).

 

What trunk?
LMAO

 

jkdrone,

I'm looking at the same setup. No doubt you've spoken to Mike from Hellroaring and you know he doesn't advocate loading the second/backup battery. I'm also planning a fridge, but will connect it to the starter battery side of the selenoid/BIC, leaving the backup battery free. The idea is that IF you run down the starter battery, you can use the backup to "boost" the first. If you load both, then there's a chance you can run down both...

js.

 

I've already swapped out the stocker with a deep cycle, and the backup battery will also be a deep cycle. Not to mention the OTHER two deep cycle batteries in the future trailer (for welding purposes). :-)

js.

 

Who says you have to use the stock battery as the primary battery? Use the deep cycle to power everything and use the stock as a backup.

I'm putting two bluetops in the new Woods trunk. (As soon as I find the time)
And using the stock as a backup with the Hellroaring isoltor.

 

I agree with 100% of what you've said. Especialy this part "it could get expensive real fast." I even chose the location for the same reason as you. Close to where my deep cycle draw will be. B

If when it's all done I measure any significant voltage drop. (2/0 is what I've decided) I will change how it is wired. Back to my original idea, same as yours.

 

To simplify, for light duty use as an auxiliary battery you can mount a battery anywhere it will fit and is safe. All you really need is reasonable sized charging wires and circuit protection used with an isolator. Essentially you are just carrying around a spare battery that happens to be charged by the alternator.

I did this for years when my Wife and I used to camp out of a pickup camper. We would travel all day and charge the extra battery. At night we would use the isolated deep cycle battery to run the fridge and lights. When we stayed at a location for many days we would just run a 120v charger.

For winch use, or other high draw applications it won't work easily, but emergency workarounds can happen if you are willing to swap batteries.

I've always felt that the two batteries in one connected tray setup was silly unless you are a hardcore winch guy or you truly need the extended capacity that no single battery can provide. You can do so much more, with less hassle using a isolator and and intelligent circuit protection.

 

I've been running dual Batteries fpr over a year now with no problems. Running all my aux loads off the rear battery. If I ever need an emergency jump I can break out the jumper cables and take care of myself.
https://www.jk-forum.com/forums/show...roaring&page=3

 

EEK! Assuming you are talking 2x 12v batteries (dual batteries is useless otherwise)a good way to fry evey electronic part in your vehicle pumping 24VDC into 12VDC equipment.
I moved the Sub woofer forward in the boot area and have just mounted a standard battery tray against one side just inside the tailgate. And that's a sfar as my plan has got so far, the firdge compressor, water pump etc will all run off this battery, and a solenoid will link it to the main when the ignition is on, the trick to this primitive sytem is to always use the same type/size/age batteries