cancel
Showing results forย 
Search instead forย 
Did you mean:ย 

replacing 6V deep cycle marine trailer batteries

rvshrinker
Explorer III
Explorer III

Hello, my trailer purchased oct 2017 has its original two โ€œGC2 Deep Cycle Extremeโ€ Interstate batteries โ€œ115 mins @ 75 amps 225 Ah @ 20 Hrโ€ wired in series and even though we havenโ€™t had any performance problems I figure itโ€™s time to replace them. 

Costco has 3 options, i believe one doesnโ€™t fit but iโ€™ll know better when I get into the store.

The first option is โ€œ24DC AGMโ€ 930 MCA and from what I read I do not need the benefit of AGM and donโ€™t need to spend the extra money.

The second option is โ€œ24DC 700 MCAโ€ and the third option is โ€œ27DC 750 MCAโ€ both Interstate batteries. I think the 27 is not the right size, so I think 24 is it.

Is this the correct batter replacement? The info on the old battery โ€œ115 min @ 75 amps 225 Ah @ 20 hrโ€ isnโ€™t comparable to whatโ€™s on the Costco battery.

I donโ€™t know why itโ€™s bolding, sorry for that.

7 REPLIES 7

StirCrazy
Navigator
Navigator

the costco GC2 are 208Ah@20h so a very comparable battery to what you have.  I wouldnt install new batteries untill you get the feeling they are not holding as much power though as a well maintained ^V deep cycles can last a lot more than 6 years.  

2014 F350 6.7 Platinum
2016 Cougar 330RBK
1991 Slumberqueen WS100

Thanks, I did go ahead with the new Costco ones since we usually dry camp and finding out the batteries are dead could be a real issue. The old ones had also run dry a couple times before I knew how to maintain them properly. With the new ones I water them monthly and will keep them in good shape.

Grit_dog
Navigator
Navigator

Golf cart batteries arenโ€™t rated in cranking amps. And Costco only has one golf cart battery. 

2016 Ram 2500, MotorOps.ca EFIlive tuned, 5โ€ turbo back, 6" lift on 37s
2017 Heartland Torque T29 - Sold.
Couple of Arctic Fox TCs - Sold

thank you!

 i've been happy with these Interstates, lasted six good years with minimal maintenance and gave us up to five days off grid. where can i find something comparable? 

You can find something comparable at any Interstate battery dealer. In fact you should be able to find the exact model batteries you currently have, or an improved version.


Putting 10-ply tires on half ton trucks since aught-four.

opnspaces
Navigator II
Navigator II

I looked again and I see that Costco does indeed list more than one GC2 battery. But all of them are little ATV batteries aside from the one 6 volt I linked and an 8 volt which you can't use. If you walk into Costco and look at the batteries on the rack it should be obvious which one you  are looking for. It will say golf cart on the label and have 3 water fill caps and it will weigh almost twice what the 12v batteries weigh.

.
2001 Suburban 4x4. 6.0L, 4.10 3/4 ton **** 2005 Jayco Jay Flight 27BH **** 1986 Coleman Columbia Popup

opnspaces
Navigator II
Navigator II

If you're looking to stay with the 6 volts like we've been discussing in the other post then the above are the wrong batteries as they are 12 volts and would have to be wired in parallel not series. Costco typically only has one 6 volt battery, the GC2. I'll link it but if the link fails, search Costco for GC2 battery.
Link

.
2001 Suburban 4x4. 6.0L, 4.10 3/4 ton **** 2005 Jayco Jay Flight 27BH **** 1986 Coleman Columbia Popup