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Old 04-14-2016, 12:39 PM   #1
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AGM starting battery

Any one using the interstate 31M-AGM starting batteries?

Interstate Batteries | Deep-Cycle | RV Batteries | Sealed AGM Battery

These batteries have plenty of CA, but is a little bit short on the CCA.

I'm thinking that I can use the battery boost feature of my Newmar Essex (ISM 500 engine) to help start on the coldest of the cold days.

Otherwise, these agm batteries should be fine.

Thanks
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Old 04-14-2016, 01:33 PM   #2
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The difference between the CCA rating and the MCA rating is 32 degrees, i.e. 0 F. vs 32 F. If you rarely need to crank the engine at temps below 32, the MCA rating will suit your needs. And you can use the Aux start function to help if needed. An engine block heater also helps, if so equipped.
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Old 04-14-2016, 02:05 PM   #3
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Thanks Gary.

Yes, I have the Aux start and the block heater.

I typically spend 2 nights in Utah as I travel to SLC (in December) where I put the coach into heated storage. This year, our coldest night was around 18 degrees.

Assuming a linear drop off of cca, I could expect a 13 amp / degree reduction in CCA, so at 18 degrees, I should have 1190 - (14 * 13) = 1008A.

Another way of looking at this, I should get at least 900A at 8 degrees or warmer.

I am going to give this AGM battery a try.
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Old 04-16-2016, 11:23 PM   #4
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I Installed 2 31M-AGM starting batteries today. So far, so good!
At 70 degrees, my engine spins faster than a spinning top.

I will report back when I try to start the engine at 20 degrees.
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Old 04-16-2016, 11:43 PM   #5
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I installed a pair of Lifeline AGM batteries this past winter, and they work the same in 20 degrees as 70.
Very happy with them.
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Old 04-17-2016, 04:28 PM   #6
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AGMs are great batteries...as is engine preheat, no need to start a really cold engine.
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Old 04-17-2016, 04:32 PM   #7
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Quote:
Originally Posted by Cat320 View Post
AGMs are great batteries...as is engine preheat, no need to start a really cold engine.
Not every diesel has pre-heat.
Mine has a block heater but no pre-heat.
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Old 04-18-2016, 12:16 AM   #8
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Quote:
Originally Posted by t55watson View Post
Not every diesel has pre-heat.
Mine has a block heater but no pre-heat.
By pre heat, I think he means a block heater.

Your motor might not have the old fashioned glo plugs and if not, it will have an intake grid heater. If you have a red light on the dash that you wait until it goes out before you start the motor, you have some form of heating going on.
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Old 04-18-2016, 11:44 AM   #9
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Quote:
Originally Posted by dons2346 View Post
...By pre heat, I think he means a block heater...
Yes, thanks for the clarification.
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