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Old 09-22-2012, 09:03 PM   #1
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2nd battery with jumper cables

I've read the posts re installing a 2nd batt, & they are helpful.
What would happen if I used jumper cables from my fully charged truck to the TT batt for 5 minutes? 5 hours? What if the truck batt was disconnected from the truck, & then jumped to the TT? Assume non matching batts.
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Old 09-22-2012, 09:10 PM   #2
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Quote:
Originally Posted by ddezurik View Post
I've read the posts re installing a 2nd batt, & they are helpful.
What would happen if I used jumper cables from my fully charged truck to the TT batt for 5 minutes? 5 hours? What if the truck batt was disconnected from the truck, & then jumped to the TT? Assume non matching batts.
The most charged battery will win. Whichever battery is charged the most will help the weaker one.
As long as they are 12 volt no harm will happen for jump starting either.
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Old 09-23-2012, 08:37 AM   #3
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I would imagine your truck would not start after being hooked up for much more than 5 minutes without the engine running. It would be like trying to fill a swimming pool with a water pitcher.
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Old 09-23-2012, 08:49 AM   #4
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You will in all likelyhood ruin your truck battery if you choose to use it as an RV battery very often as there is quite a difference in the physical makeup of the 2 types of batteries. A google search or even a trip to Interstate battery website will give you an idea. I have included one link but there are thousands of articles on this subject.
HowStuffWorks "What's the difference between a normal car battery and a deep-cycle battery?"
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Old 09-23-2012, 09:30 AM   #5
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Originally Posted by ddezurik View Post
Assume non matching batts.
That's the key here. Batteries of differing size, age and type should not be wired together. One problem as mentioned already is that one battery will be drawn down faster and deeper. That will be the truck battery as its not made to be discharged by more than 5% or so before the alternator recharges it. You will be replacing it sooner than later.

The better option is just to buy a battery similar to your current deep cycle or marine and either install it or swap the two when the TT battery is discharged.
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Old 09-23-2012, 11:03 AM   #6
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