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03-06-2023, 07:25 AM
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#1
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Established Member
Join Date: Feb 2019
Location: Dixon
Posts: 22
M.O.C. #23412
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AGM Batteries and Summer Heat
We are going to leave our MHC 323RL in Arizona on our RV park lot this year from May-October. I have 2 new AGM batteries in the rig that I installed last October. I can leave them in the rig on a maintainer or take them out and put them in a local garage, also on a maintainer where they won’t be exposed to the heat every day. Has anyone done this before, and if so what was the best way to protect your batteries? Did the Arizona summer heat kill your batteries?
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03-06-2023, 09:50 AM
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#2
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Montana Master
Join Date: Dec 2007
Location: Kansas City, Missouri
Posts: 2,707
M.O.C. #7992
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Know very little about AGM but I would disconnect the negative cable and leave them in the unit. See no need for a trickle charge.
__________________
2006 3000RK
2009 Ram 2500
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03-06-2023, 10:06 AM
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#3
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Site Team
Join Date: Jun 2011
Location: Wilsey
Posts: 18,799
M.O.C. #11455
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We only use AGM batteries in our rigs and the one that stays in Tucson just has the negative disconnected while we're gone.
__________________
Dick, Joyce, Diego, Picatso and Gustav
2017 3720 RL, and 2013 HC 343RL
Pullrite Hitch, IS, Disk Brakes, 3rd AC, Winegard Traveler, Bathroom door mod, Dometic 320, couch for desk swap, replaced chairs, sun screens, added awnings, etc.
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03-06-2023, 10:59 AM
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#4
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Site Team
Join Date: Sep 2017
Location: Oro Valley
Posts: 3,930
M.O.C. #20477
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Agree with Dick, completely disconnect the batteries. Need need to keep them on a charger.
__________________
Zack and Donna plus Millie and Ranger
2018 3160RL
"Life is too short to stay indoors, enjoy the ride!"
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03-07-2023, 09:17 AM
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#5
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Montana Fan
Join Date: Aug 2017
Location: Olmsted Falls
Posts: 215
M.O.C. #20364
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Only thing to do with AGM is to ensure they are fully charged, then disconnect the negative terminal as suggested above. They will be fine for months stored fully charged in the battery compartment of your unit.
__________________
Rick & Joyce Jones
RMC(SW) USN Ret.; AT&T Ret.
2024 3231CK, IS, 400W Solar, Slide covers, Predator Gen,, 2016 Chevy High Country 3500 Diesel Dually 
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03-09-2023, 06:14 PM
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#6
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Established Member
Join Date: Feb 2019
Location: Dixon
Posts: 22
M.O.C. #23412
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Quote:
Originally Posted by Our3820FK
Only thing to do with AGM is to ensure they are fully charged, then disconnect the negative terminal as suggested above. They will be fine for months stored fully charged in the battery compartment of your unit.
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We’ll be gone for 6 months. Will they last that long without being on a charger occasionally?
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03-10-2023, 07:08 AM
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#7
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New Member
Join Date: Dec 2022
Location: Southlake
Posts: 2
M.O.C. #32116
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Yes, they will be fine but you'll want to recharge them when you get back to your RV. AGM's are the same chemistry as flooded cell lead acid, the acid is in Absorbent Glass Mats, the result is more plates per open area and they can be sealed with a one way vent cap.The construction makes them sulphate and self discharge at a much slower rate than flooded cell batteries and the acid is "hotter" so they finish with a higher voltage.
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03-10-2023, 07:29 AM
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#8
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Established Member
Join Date: Feb 2019
Location: Dixon
Posts: 22
M.O.C. #23412
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Should I disconnect both battery leads, or only the negative?
Does it make any difference if they are completely disconnected from the rig, or left in place with the + still connected?
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03-10-2023, 08:21 AM
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#9
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Montana Master
Join Date: Jan 2022
Location: Shingle Springs
Posts: 2,227
M.O.C. #30417
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Just disconnect the negative from both.
__________________
Tony & Donna
2022 Montana HC, 295RL, Solar Flex 400, Onan 3600 LPG, 2K inverter, 200AH Lithium. 2020 GMC Denali 2500 6.6 Duramax, Demco 21K Auto Slide
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03-11-2023, 06:07 AM
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#10
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Established Member
Join Date: Feb 2019
Location: Dixon
Posts: 22
M.O.C. #23412
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I’ll do that—thanks!
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