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Old 12-19-2014, 12:39 PM   #11
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Inter-State deep cell RV Marine 12 v. Two are better than one. Pricey, but they work
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Old 12-19-2014, 01:16 PM   #12
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If you should decide to with the 6v Costco's are made by Interstate and are around $85. I highly recommend them.
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Old 12-19-2014, 01:37 PM   #13
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Just so y'all are on the same page - it is a CO (carbon monoxide) detector. CO2 (carbon dioxide) is what you exhale and if there was a detector for CO2, it would be going off all the time. Most of the CO detectors need to be disconnected for 1 minute each year then reconnected to "reset them" and ensure a good electrical continuity. Poor contacts will cause just a bit of corrosion and will make the unit sound off when it really is not detecting any CO.
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Old 12-19-2014, 01:41 PM   #14
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HMMM... from what YOU say..you just need a basic good 12V wet cell battery...of the true deep cycle variety. Perhaps two... if you do more boondocking. I like the idea of two since it gives you redundancy. I don't like the idea of dual 6V's because if one goes out...you are toast.
So...I'd either get the largest 12V that will fit...a Group 31 might be possible... or the larges pair of 12V's that will fit...probably more like group 24's . Group 27's are close in size to the group 31's so they remain an option.. and if you have some extra height clearance to spare you can get the tall versions.
I'll go with Ependydad that the Trojan wet cells are the best made wet cells out there and can often be found at a decent price...though not to compare with the cheaper stuff.
Alternatively I like the Deka Marine line of deep cycles ALL of which have a DC in their model numbers so you know you are getting a true deep cycle performer. Avoid any batter that mentions cranking amps or CCA's on the label...even if it says deep cycle. It ain't! Good luck!!
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Old 12-19-2014, 01:47 PM   #15
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best battery

I have read that besides brand name one way to judge a battery is by comparing weights as they are an indicator of the amount of lead used in the plates.
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Old 12-19-2014, 02:14 PM   #16
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I would generally disagree with that today....since new formulations have been developed which throw those calculations off. And of course, there is a world of difference in construction of plates, separators and connectors which makes a difference in on the road performance vs. on a lab table. Just a quick example:
Trojan group27=55lbs.
Deka Marine Master True Deep Cycle=53lbs.
Interstate DUAL Purpose (no 20 hour rating!) = 53lbs

While it may be true that the Trojans are a bit better than the Dekas...there is no way that the Interstates are the Deka's equal even though they are sold as Deep Cycle...they are dual purpose and have thinner plates but more of them!
BTW...Interstate makes NO deep cycles other than the golf cart 6v's .
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Old 12-19-2014, 02:16 PM   #17
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BATTERY

Good points
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Old 12-19-2014, 02:18 PM   #18
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Quote:
Originally Posted by camaraderie View Post
Alternatively I like the Deka Marine line of deep cycles ALL of which have a DC in their model numbers so you know you are getting a true deep cycle performer. Avoid any batter that mentions cranking amps or CCA's on the label...even if it says deep cycle. It ain't! Good luck!!
I will say- I was a little surprised when I spoke to 3 different battery shops and all 3 tried to sell me a hybrid battery when I specifically asked for a "deep cycle" battery. I had to research which battery that I wanted and needed to know precise measurements for my battery box.
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Old 12-19-2014, 02:41 PM   #19
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A good comparison chart.

http://blogsdir.cms.rrcdn.com/37/fil...ison-Chart.pdf
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Old 12-20-2014, 06:37 PM   #20
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We got a pair of deep-cycle size 27 12V batteries for our MH from Costco when we bought it (used). Original owners had done 8 years with a single one that was with the rig from the factory.

They were about $75 each and we hadn't had any trouble in the four years + while we had the rig.
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