Diehard Platinum group 65, 34 or one of each?

[Higbean]

I'm going to get rid of my 2yo Kirkland group 65 batteries (850 cca) because they are already corroding things. Looking to do the $50 isolator and would like to know what you folks think I should go with. I have room for two group 65s but they are on opposite fender wells. I could pretty easily get the group 34ms to fit on one side cleaning up a few long cable runs. I was under the impression the marine battery was a deep cycle, but after looking at the specs, I can't see where they are any different than the auto group 65. Can anyone tell me different? Should I go with two 65s or one?

Here are the batteries I'm talking about. I'm not running anything out of the ordinary like a fridge yet, but I'd like to down the road.

http://www.sears.com/diehard-platin...p-02850134000P?prdNo=2&blockNo=2&blockType=G2

http://www.sears.com/diehard-platin...2851065000P?prdNo=10&blockNo=10&blockType=G10

 

[GorillaJoe]

Ignore the CCA#. That doesn't have much to do with anything besides on-demand cranking amps for your starter. Look at the AH (20 hour Amp Hour Capacity) number. The bigger the number the better. Sometimes battery makers only list the 10 hour rate, which is often times more conservative than the 20 hour rate.

That G65 Battery has a 135 minute reserve capacity (just like the G34), but is a heaver battery than the G34. That tells me the G65 is going to likely have a higher AH Capacity. Probably like 75-80AH.

To be honest, getting the bigger batteries will be better for a wider DoD (Depth of Discharge) if you plan on using high current appliances in the future. Those platinum's are AGM batteries so they should be good for a long time. Get two of the G65's. You'll be happier for future builds.

 

[wrcsixeight]

With the DHP's ,the difference between Marine and Non marine batteries, is the addition of threaded studs in addition to the automotive posts. No other internal differences.


Perhaps the warranty on the Marine battery is shorter too, not sure about that With DHP's

The Group 65 DHP have really high CCA ratings for their capacity, when compared to the 34's which are fairly similar in capacity. Higher CCA means less resistance which can mean, faster recharging too, if the recharging source can pump out the higher amps in the bulk stage to take advantage of it.

Deeply cycled Odyssey batteries crave a minimum 40% recharge rate, at least every few cycles, so having a grid powered plug in charger capable of meeting their recommended recharging rates will yield much longer life and performance during that life.

Scroll down to page 15 on the following link:

http://www.odysseybattery.com/documents/US-ODY-TM-001_0411_000.pdf

Your alternator is unlikely to hold 14.7 for the 4 hours required even if it can meet and hold 40% rate, which is also unlikely.