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Old 07-11-2017, 01:00 PM   #1
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Adding Second Battery

OK. I just have one 12v battery on my 4 year old Keystone Outback Kangaroo 310TB. I have ruled out messing with creating a 4 bank 6V battery bank, due to keeping it simple with fewer cables and batteries to purchase right now, and a second battery will fit on the tongue easily next to the other. At 4 years old, that is probably the reason that there seems to be little reserve. So two new 12 batteries.

I am thinking of just sticking with easily obtainable NAPA battery, like original: #8240, a 24DCM/685 CA/550CCA/120RC.

#1 Do you actually get about twice the amps to use between battery charging?

#2 Should my built in stock battery charger that came on my 2014 Keystone (4 years old now) Outback Kangaroo be able to handle the charging task of two batteries?

#3 I understand I will be hooking two 12V batteries in parallel, pos to pos & neg to neg; but do I leave connection to trailer and charger just hooked to one of the batteries, or should I hook one Trailer lead to pos of one battery and the neg to other battery?
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Old 07-11-2017, 02:01 PM   #2
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Don't know if the answer to your question would be covered at this site, but it might be worth a read.

www.marxrv.com/12volt/12volt.htm
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Old 07-11-2017, 02:04 PM   #3
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Actually, concerning #3, it would be 6 one, or half a dozen of the other since hookup to either pos or neg posts of different batteries is the same, since they are tied together by cables pos to pos & neg to neg!
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Old 07-11-2017, 03:49 PM   #4
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Put in 2, 6 volt batteries and get more AH capacity and longer lasting batteries than 2 of the batteries you now have.

Simple wiring, just need one jumper from + on battery A to - on battery B.



Using the type battery you now have, calculates to about 70 AH. Install 2 and double your capacity to 140 AH.

Each 6 volt battery is about 205 to 235 AH, according to price. Install two to get 12 volts at about 205 to 235 AH. Now you have tripled your capacity.

NAPA sells them.
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Old 07-11-2017, 03:59 PM   #5
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I would do what Twinboat recommended (use 2 6 volt in series), you will get more AH out of them, if you are set on using 2 12V you will want to put the the negative on one battery and positive on the other battery, this will allow the batteries to discharge and charge at the same rate. Just make sure you go pos to pos and neg to neg.
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Old 07-11-2017, 04:14 PM   #6
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As far as your converter charger, it will do the job, but of course there is no free ride. With twice or three times the capacity, it may take that much longer to replace the AH you use.

See how many amp output the charger is. The typical recommendation is an output of about 15% of your battery capacity, with flooded batteries.
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Old 07-11-2017, 04:57 PM   #7
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Sorry about the link in post #2 , I've used that link for years and today it's not working.
Can't get it direct from my laptop either.
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Old 07-11-2017, 05:06 PM   #8
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6V Golf Cart batteries best fir house use and they are the lowest $/AH.
Bonus...they are rugged and will last longer than most 12V if taken care of.
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