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Old 01-12-2019, 08:02 PM   #1
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theBeav's Avatar
Join Date: Jan 2018
Posts: 104
Another Battery Post - Different, I swear

I have come to the conclusion that I need to replace my house batteries. As I do some research, I have found that all advice says that all of the house batteries should be the same "type". Flooded Lead Acid, AGM, etc.
In my rig, only owned it for 8 months, and still learning, I figured out that I have 4 200ah AGM sealed Lead acid batteries. Two of the AGMs have the blade connection and don't list the CCA rating, while the other two have the standard battery pole and connection, and list the CCA. As I read HandyBob, he indicates that the two that don't list the CCA are real deep cycle batteries, while the other two, are "hybrid". They even have the words "Super Start" on the bar code sticker. When charging, the Magnum 2812 charger supplies about 13.7 volts during absorb phase, which is below the manufacturers recommended 13.8 - 14.5 volts. I have the battery type set to AGM 2 on the remote.

With almost everything off except the furnace, I couldn't even get through the night while boondocking the other night. I didn't let the voltage fall below 12.0 volts though. I hear that it's Ok to take AGMs down 80%, but recharge it right away.

Am I right on my diagnosis?

George and Melissa
2007 Beaver Marquis
Movin' the Marq
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Old 01-12-2019, 09:16 PM   #2
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Join Date: Aug 2001
Location: North America somewhere
Posts: 18,428
The best advice i can offer is to read The 12 Volt Side of Life-parts 1 and 2. As all most of have learned from reading it too.
You may very well have an unmatched set of batteries. They require different charging cycles, and the lighter of the 4 batteries determine how much charge the deeper batteries receive.
Are there any markings at all on the 2 blade connection batteries?
2000 Winnebago Ultimate Freedom USQ40JD, ISC 8.3 Cummins 350, Spartan MM Chassis. USA IN 1SG 11B5MX,Infantry retired;Good Sam Life member,FMCA." My fellow Americans, ask not what your country can do for you, ask what you can do for your country. John F. Kennedy
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