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Old 04-03-2019, 06:41 PM   #1
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Recommended battery brand and group size

We have a 21FBRS TT and will be replacing our single 6V battery with 2-6V golf cart batteries as we are planning to do long periods of state and national park camping now that we are retired. We are experienced with conserving electricity, water, waste, etc for short periods of time, but we can now extend our trips to a month or more. We are also planning to get a 2200 Honda or Yamaha generator to recharge the batteries. No current plans to use the generator for AC so I believe that we will not need the companion generator as of now. We are trying to decide on which battery brand and group size to get. Any recommendations? COSTCO sells Interstate batteries at a good price but I do not know anything about them. Trojans are over our budget but we don't mind paying more for a brand that is much better than others. Any recommendations would be greatly appreciated.
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Old 04-03-2019, 07:09 PM   #2
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Costco sells the Interstate GC-2 6V battery - I think that's the only size of golf cart battery they sell. Here in Colorado Springs, Costco sells GC-2s by the dozens - for both RVs and golf carts - so they are always fresh. Very similar in size to a Group 24 12V, but about 3/4" taller. $95 + $15 core charge.

I used them in my previous A-frame, and liked them so well I told the dealer to keep his Group 27 battery on my new A-frame (he gave me a $110 credit for not taking his battery). Went to Costco and bought 2 more Interstate GC-2s.

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Old 04-04-2019, 06:41 PM   #3
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I like Trojans
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Old 04-07-2019, 07:29 PM   #4
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Originally Posted by jwalt313 View Post
We are also planning to get a 2200 Honda or Yamaha generator to recharge the batteries.
Just remember that although the Honda and Yamaha have a "12v battery charging cable" available, it is going to charge at a much lower amp rate than your converter/charger will. Just run the converter on the 120v side of the generator for the fastest charge.
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Old 04-09-2019, 11:30 AM   #5
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For boondocking it is very worthwhile to purchase an AGM battery because you can generate more amp/hours and drawdown the battery to 50% without hurting it. Lithium is even better but expensive.
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Old 04-09-2019, 11:45 AM   #6
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For boondocking it is very worthwhile to purchase an AGM battery because you can generate more amp/hours and drawdown the battery to 50% without hurting it. Lithium is even better but expensive.
The advantages of AGM is that they can charge faster than FLA which means shorter generator run time. For the same reason they charge faster, they also have less voltage sag when running a large inverter which means they don't hit low voltage cuttoff as easy. No water to add especially useful if batteries are hard to get at. Less self discharge. They still have the same characteristics as FLA which means the further you draw them down, the more capacity they lose and they still can suffer from sulfation when left at lower than 100% charged.

Personally, I would always pick an AGM over a FLA. To me, well worth the extra cost.
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Old 04-09-2019, 11:49 AM   #7
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I got the Deka golf cart batts, FLA (flooded lead acid). These are also fine to draw down to 50% without damaging them. Going to cost you about 300 bucks for the pair of them. https://www.lowes.com/pd/Deka-6-Volt...ttery/50183775 Many batteries are made by the same company and labelled for different sellers. Deka is made by East Penn battery company.
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Old 04-09-2019, 12:16 PM   #8
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Deka (East Penn Mfg.)Duracell at Sam's Club and Batteries Plus all the same. Hard to beat price at Sam's or Batteries Plus.
Dekas at Lowes are not 448AH. They are 230 just like Sam's Club.
Sam's Club $89. Batteries Plus $119.
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Old 04-09-2019, 01:13 PM   #9
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That is correct about the error in the Lowes ad, it is supposed to be 230 AH. I got ripped! Even with my military discount I paid 130 each before the core charge and tax.

They closed my friggin' Sam's Club, and now the Batteries Plus (the one near me)is out of business. Thanks for heads up on the better pricing though.
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Old 04-11-2019, 10:15 AM   #10
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If you want wet lead acid batteries to last you can only use 5% of their capacity. AGM will last much longer if they are not drawn down past 50%.

wla golf cart batteries have much greater amp hours than a lot of comparable 12v batteries, but since they are only 6 volts that produce half the watts.

100 amp/hr 12v produces 1200 watts total.
200 amp/hr 6 v produces 1200 watts total. Only the first 5% is available for long term use.
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