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Old 03-13-2015, 02:19 PM   #1
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Recommended 12V Battery Brands

I'll be picking up a new-to-me TT soon and the dealer will include an Interstate battery. Although I don't dry camp, I have had an occasion where the CG power went out late afternoon and we drained the battery in one night just using the interior lights and the fridge. So I'm thinking about upgrading to a better quality deep cycle battery. I know that Trojan is highly recommended but for my purpose it's probably overkill. Certainly very expensive.

So I'm looking for recommendations on a decent brand 12V deep cycle battery and the size and Amp-Hours rating I should consider. I can get US Battery and DEKA (East Penn) brand batteries fairly local.

Switching to LED bulbs is in the future but probably not this year.
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Old 03-13-2015, 03:59 PM   #2
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While the interstate battery in not a Trojan, they are good. It just may be time to replace the interstate? How old is it?
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Old 03-13-2015, 04:08 PM   #3
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I started running Deka in all of my Harleys. They do extremely well for us. I think that they make a good battery. I run 2 group 27 battery's in my Cardinal. I have a residential style fridge with an 2000 what inverter.
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Old 03-13-2015, 04:38 PM   #4
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Quote:
Originally Posted by whj77372 View Post
While the interstate battery in not a Trojan, they are good. It just may be time to replace the interstate? How old is it?
Dealer will supply a brand new Interstate battery. If I want to use something a little better I'll have to try to negotiate a store credit for the value of the Interstate battery.

The Interstate battery is actually a dual purpose (deep cycle/starting) battery and they don't list a 20 Hour rating.

From the info on their websites (20 Hr ratings):
DEKA DC27, 90 Amp-hrs
US Battery US 27DC XC2, 105 Amp-hrs
Trojan 27TMX, 105 Amp-hrs
Interstate SRM-27, 96 Amp-hrs (est. from Trojan literature)
Canadian Tire Nautilus 27 (Exide?), 100 Amp-hrs
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Old 03-13-2015, 04:43 PM   #5
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I had dual large Interstate marine/RV deep cycle batteries on my previous TT. No complaints at all - still good after 9 years. I always took them out and put them on a smart-charger in the unheated garage during the winter, almost always being floated by the RV power center otherwise.
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Old 03-13-2015, 04:49 PM   #6
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Two srm24 interstate ' s so far so good "4 years"
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Old 03-14-2015, 01:03 PM   #7
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The key here may be the fact that the fridge is using 12V power. Was it for cooling or just for the electronics portion? I have never run a fridge on 12V for cooling, always 110V or propane but I suspect cooling with 12V is a major drain? I have sold EastPenn for the last 6-7 years now with no major issues/comebacks. Perhaps it won't matter what battery is there, if the fridge is cooling with 12V the useful life could be relatively short between charge cycles? IMO. Keep in mind I have been wrong a time or two.
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Old 03-14-2015, 03:14 PM   #8
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Definitely want to run the fridge on gas if not on shore power.
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Old 03-14-2015, 04:46 PM   #9
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Costco now sells Interstate deep cycle RV/Marine batteries. Available in store. Better price than most other sources.
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Old 03-14-2015, 04:51 PM   #10
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I have been buying Costco batteries since the store opened in Windsor. Their batteries are made by Interstate which is owned by Johnson Controls, one of the largest battery producers in the world. Costco has the best warranty in the business, hands down. If your battery loses its "oomph" over a couple of years, you carry it in and they give you your money back. I think over 3 years it is pro-rated but check first as I am not certain. Also take an old battery of any brand with you to the store to offset the $10 core charge on the new battery you buy. Can't go wrong with Costco.
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