2nd battery
Thread Starter
CF Veteran
Joined: Dec 2011
Posts: 1,050
Likes: 2
From: Roanoke, VA
Year: 1990
Model: Cherokee
Engine: 4.0
I wasn't sure if this should go in mod tech or OEM tech, but here it is anyways
So I replaced my battery a few weeks back, and the dude at the door said eh no core charge om not concerned....
So I have my old battery still, and I'm thinking/ wanting to do a 2nd bakery in the back for whatever the occasion may be- as a good backup or for quick power tool use. My question is can someone point me in the right direction of what all is entailed in this other then the battery switch (the 80 dollar ones to select between the two) and if there are any other modifications ill have to make to accomadate the 2nd battery
I don't plan on using it except for auxiliary use / a 2nd starting battery invade the 1st one goes, so I should just need a selector.and some 2 gauge right?
So I replaced my battery a few weeks back, and the dude at the door said eh no core charge om not concerned....
So I have my old battery still, and I'm thinking/ wanting to do a 2nd bakery in the back for whatever the occasion may be- as a good backup or for quick power tool use. My question is can someone point me in the right direction of what all is entailed in this other then the battery switch (the 80 dollar ones to select between the two) and if there are any other modifications ill have to make to accomadate the 2nd battery
I don't plan on using it except for auxiliary use / a 2nd starting battery invade the 1st one goes, so I should just need a selector.and some 2 gauge right?
CF Veteran
Joined: Feb 2012
Posts: 1,206
Likes: 2
From: Southern Oregon
Year: 1990
Model: Cherokee
Engine: 4.0
Your also going to need an air tight box that vents outside the cab because the battery will release toxic fumes into the cab otherwise, but that's only if you going to have it in the back of your jeep. You could always remove the air box and put it there, there is a write up around the site somewhere. Do a search for dual batteries you should find what your looking for.
Oh and this would be mod tech, in my opinion.
Oh and this would be mod tech, in my opinion.
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Joined: Aug 2011
Posts: 43,971
Likes: 1,579
From: Prescott, Az
Year: 1990
Model: Cherokee (XJ)
Engine: 4.0
I wasn't sure if this should go in mod tech or OEM tech, but here it is anyways
So I replaced my battery a few weeks back, and the dude at the door said eh no core charge om not concerned....
So I have my old battery still, and I'm thinking/ wanting to do a 2nd bakery in the back for whatever the occasion may be- as a good backup or for quick power tool use. My question is can someone point me in the right direction of what all is entailed in this other then the battery switch (the 80 dollar ones to select between the two) and if there are any other modifications ill have to make to accomadate the 2nd battery
I don't plan on using it except for auxiliary use / a 2nd starting battery invade the 1st one goes, so I should just need a selector.and some 2 gauge right?
So I replaced my battery a few weeks back, and the dude at the door said eh no core charge om not concerned....
So I have my old battery still, and I'm thinking/ wanting to do a 2nd bakery in the back for whatever the occasion may be- as a good backup or for quick power tool use. My question is can someone point me in the right direction of what all is entailed in this other then the battery switch (the 80 dollar ones to select between the two) and if there are any other modifications ill have to make to accomadate the 2nd battery
I don't plan on using it except for auxiliary use / a 2nd starting battery invade the 1st one goes, so I should just need a selector.and some 2 gauge right?
What are you gonna bake in the back of your Jeep?
CF Veteran
Joined: Sep 2011
Posts: 4,172
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From: Riviera, Texas
Year: 1998 Sport
Model: Cherokee
Engine: 4.0
Seasoned Member
Joined: Jun 2010
Posts: 448
Likes: 0
From: Charleston, SC
Year: 1990 - 2000
Model: Cherokee
Engine: 4.0
I put two in the trunk of my Chevelle and it helped the weight distribution. Other than that, it was not worth it. I ended up smoking the FEI ECU when I switched the switch to off while it was running. Buy one good battery and an ammeter/ volt meter.
CF Veteran
Joined: Apr 2011
Posts: 4,825
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From: Indianapolis
Year: '99 and '91
Model: Cherokee
Where did you put the first bakery?
Anyways, power tools? Do you have an inverter installed already? I'd say if the spare battery is actually good, just stores it. Keep it maintained (charged) and when you need it, it can be a spare. If it lasts that long.
Anyways, power tools? Do you have an inverter installed already? I'd say if the spare battery is actually good, just stores it. Keep it maintained (charged) and when you need it, it can be a spare. If it lasts that long.
Thread Starter
CF Veteran
Joined: Dec 2011
Posts: 1,050
Likes: 2
From: Roanoke, VA
Year: 1990
Model: Cherokee
Engine: 4.0
but i have an inverter i am gonna buy from a friend, i used it during the christmas parade for the lights, and i just figured a 2nd battery could be useful for any situation...but at the same time, all you guys arguements for just keeping it in the back and not hooking it up are good thoughts...probably will end up just going that route and having some leads coming off it or something...
but all in all thanks guys
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Joined: Aug 2011
Posts: 43,971
Likes: 1,579
From: Prescott, Az
Year: 1990
Model: Cherokee (XJ)
Engine: 4.0
haha im not sure where the bakery part of this came from...probably auto correct on my phone i use it more often for the forum then my computer...
but i have an inverter i am gonna buy from a friend, i used it during the christmas parade for the lights, and i just figured a 2nd battery could be useful for any situation...but at the same time, all you guys arguements for just keeping it in the back and not hooking it up are good thoughts...probably will end up just going that route and having some leads coming off it or something...
but all in all thanks guys
but i have an inverter i am gonna buy from a friend, i used it during the christmas parade for the lights, and i just figured a 2nd battery could be useful for any situation...but at the same time, all you guys arguements for just keeping it in the back and not hooking it up are good thoughts...probably will end up just going that route and having some leads coming off it or something...
but all in all thanks guys

Unless you need the additional instantaneous current capacity it really won't do much. You're still limited by the alternator rating for continuous usage. A second battery just allows you to exceed that rating for a longer period of time before you're out of juice.
::CF Moderator::
Joined: Aug 2011
Posts: 43,971
Likes: 1,579
From: Prescott, Az
Year: 1990
Model: Cherokee (XJ)
Engine: 4.0
Thanks for snapping us back into reality. I had a great mental picture of the E-Z bake oven in the back of his XJ.
Given that batteries are really heavy I tend to think it would not be worth hauling around the extra weight on the off-chance that you might maybe have a use for it some day. Put it on a shelf in the garage on a battery tender.
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