Journey with Confidence RV GPS App RV Trip Planner RV LIFE Campground Reviews RV Maintenance Take a Speed Test Free 7 Day Trial ×
RV Trip Planning Discussions

Go Back   iRV2 Forums > MOTORHOME FORUMS > Class A Motorhome Discussions
Click Here to Login
Join iRV2 Today

Mission Statement: Supporting thoughtful exchange of knowledge, values and experience among RV enthusiasts.
Reply
  This discussion is proudly sponsored by:
Please support our sponsors and let them know you heard about their products on iRV2
 
Thread Tools Search this Thread Display Modes
 
Old 01-12-2022, 04:46 PM   #1
Senior Member
 
Doug427's Avatar


 
Join Date: Dec 2019
Location: Houston, TX
Posts: 987
Need to replace both 12v chassis batteries - what size are these?

Both my chassis batteries are bad. They got discharged and they won't take a charge anymore. When I bought the RV, the previous owner had just replaced the chassis batteries with these, and from what I'm told they're really low quality batteries. They're date coded October, 2019. I'm thinking they should have lasted longer than this, but again they're really low quality batteries.



My problem is they're not labeled with a size. I've asked Newmar via email since they never answered the phone and I haven't heard back from them. Does anyone with this era Newmar DP know what size batteries are in there? Or, can anyone tell by looking at these what size they are?


Is there any reason to go with AGM? The 6v house batteries in there are wet cell, so there's no keeping the battery compartment cleaner benefit to going AGM in that respect. Other than keeping the battery compartment cleaner, is there an operational benefit to AGM's?


I'm thinking by appearance they seem to be this size:


https://www.batteriesplus.com/produc...up-31/sli31shp


Is size 31 common in this application?
Attached Thumbnails
Click image for larger version

Name:	IMG_2975.jpg
Views:	21
Size:	412.8 KB
ID:	353664  
__________________
2005 Newmar Mountain Aire 4304 - 4 slides
2011 Jeep Liberty 4X4 towed
Doug427 is offline   Reply With Quote
Join the #1 RV Forum Today - It's Totally Free!

iRV2.com RV Community - Are you about to start a new improvement on your RV or need some help with some maintenance? Do you need advice on what products to buy? Or maybe you can give others some advice? No matter where you fit in you'll find that iRV2 is a great community to join. Best of all it's totally FREE!

You are currently viewing our boards as a guest so you have limited access to our community. Please take the time to register and you will gain a lot of great new features including; the ability to participate in discussions, network with other RV owners, see fewer ads, upload photographs, create an RV blog, send private messages and so much, much more!

Old 01-12-2022, 07:03 PM   #2
Member
 
Join Date: Jun 2010
Location: Toronto
Posts: 47
They are 31's. Buy interstate or Deka brands.
No benefit to AGM there.
islandbob is offline   Reply With Quote
Old 01-12-2022, 07:14 PM   #3
Senior Member
 
Barneyb's Avatar
 
Fleetwood Owners Club
Freightliner Owners Club
Join Date: Jan 2019
Location: Wadsworth, Ohio
Posts: 324
https://www.batteryweb.com/bci
__________________
Barney & Penny with our two puppies Lucy & Dixie
2008 Fleetwood Discovery
2020 Jeep Cherokee Trailhawk
Barneyb is offline   Reply With Quote
Old 01-12-2022, 07:14 PM   #4
Member
 
Join Date: Jun 2010
Location: Toronto
Posts: 47
An additional thought, make sure that these chassis batts get charged when on shore power. Some manufacturers did not set this up. If not then either buy it a separate mini charger to keep them up or simply use a jumper cable from output positive terminal between the output of both chassis and house banks when not driving.
islandbob is offline   Reply With Quote
Old 01-18-2022, 02:30 PM   #5
Moderator Emeritus
 
Gary RVRoamer's Avatar


 
Join Date: Jan 2000
Location: Silver Springs, FL. USA
Posts: 25,036
Agree - not much reason to buy AGM chassis batteries. For cranking a diesel, you generally want a pair of batteries rated at around 1000 CCA each, and that usually means the Group 31 case size. They should last 5-7 years in normal use.

If you are a Sam's Club or Costco member, they usually have a good price on Group 31 cranking batteries. Freightliner dealers too - their Alliance brand batteries are reliable and usually reasonably priced.
__________________
Gary Brinck
Former owner of 2004 American Tradition and several other RVs
Home is West Palm Beach, FL
Gary RVRoamer is offline   Reply With Quote
Old 01-18-2022, 03:13 PM   #6
Senior Member
 
vseasport's Avatar
 
Join Date: Oct 2019
Location: Buena Vista, Baja California Sur
Posts: 625
Look like group 27 to me.? Less than 2 1/2 years old they shouldn't need be replaced unless abused.
__________________
Mark & Jen Rayor, Baja Ca Sur, Mexico
04 Phaeton 38, 3126E Cat 330 AKA "Big Pooper"
toad "Mini Cooper" 15 "Wee Willys" Wangler
vseasport is offline   Reply With Quote
Old 01-18-2022, 03:27 PM   #7
Senior Member
 
astrnmrtom's Avatar
 
Join Date: Sep 2013
Location: Pacific Northwest
Posts: 1,600
You can measure to be sure.

https://www.batteryequivalents.com/b...ize-chart.html
__________________
Tom M. 1998 Safari Serengeti 3706,
300HP Cat 3126 Allison 3060, 600 watts of Solar.
Fisher and Paykel Residential refrigerator
astrnmrtom is offline   Reply With Quote
Reply

Tags
batteries, chassis, chassis batteries, replace, ace, 12v



Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Chassis 12v works, Coach 12v doesn't...hmm cassmandoo Fleetwood Owner's Forum 9 04-16-2021 07:03 AM
I Need both a Switched and Constant 12v power source near the driverís seat. BPoland Newmar Owner's Forum 4 04-11-2021 05:39 AM
A/C units both work well for 15 t0 45 min then BOTH shut down baustin RV Systems & Appliances 2 09-26-2014 06:57 PM
Adding batteries 12v- do they have to be same size? dooubravsky RV Systems & Appliances 19 07-23-2014 02:59 PM
No 12V to both furnace's etzelb MH-General Discussions & Problems 5 05-04-2011 09:49 AM

» Featured Campgrounds

Reviews provided by


All times are GMT -6. The time now is 04:22 AM.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2022, vBulletin Solutions, Inc.