RV.Net Open Roads Forum: Tech Issues: Is it OK to mix battery types??

RV Blog

  |  

RV Sales

  |  

Campgrounds

  |  

RV Parks

  |  

RV Club

  |  

RV Buyers Guide

  |  

Roadside Assistance

  |  

Extended Service Plan

  |  

RV Travel Assistance

  |  

RV Credit Card

  |  

RV Loans

Open Roads Forum Already a member? Login here.   If not, Register Today!  |  Help

Newest  |  Active  |  Popular  |  RVing FAQ Forum Rules  |  Forum Posting Help and Support  |  Contact  

Search:   Advanced Search

Search only in Tech Issues

Open Roads Forum  >  Tech Issues

 > Is it OK to mix battery types??

Reply to Topic  |  Subscribe  |  Print Topic  |  Post New Topic  | 
Page of 2  
Next
Sponsored By:
sprintstream

At Home

New Member

Joined: 05/09/2015

View Profile


Offline
Posted: 06/28/20 01:37pm Link  |  Quote  |  Print  |  Notify Moderator

I have a new trailer along with its accompanying new 12v deep cycle battery. I also have a nearly new large 12v diesel starting battery just sitting in the garage. I would like to hook them up together to improve my available AmpHrs. Is there any problem to doing that I don't see? It irks me to have the diesel battery sitting there doing nothing. (yes, I know to hook them in parallel)


Was living the dream in the Ozarks
Now just living

Lwiddis

near Jawbone Canyon, CA

Senior Member

Joined: 08/12/2016

View Profile



Good Sam RV Club Member

Offline
Posted: 06/28/20 01:46pm Link  |  Quote  |  Print  |  Notify Moderator

Starting batteries don’t do well with long, low amp hour discharges. Not built for that type of service.


Winnebago 2101DS TT & 2020 Chevy Silverado 1500 LTZ Z71, 300 watts solar-parallel & MPPT, Trojan T-125s. TALL pole for flags. Prefer USFS, COE, BLM, NPS, TVA, USF&WS, state & county camps. Bicyclist! 14 year Army vet - 11B40 then 11A - (MOS 1542 & 1560)


time2roll

Southern California

Senior Member

Joined: 03/21/2005

View Profile



Good Sam RV Club Member


Posted: 06/28/20 01:57pm Link  |  Quote  |  Print  |  Notify Moderator

Yes it is OK. May as well put them to use.


2001 F150 SuperCrew
2006 Keystone Springdale 249FWBHLS
675w Solar pictures back up

midnightsadie

ohio

Senior Member

Joined: 01/07/2008

View Profile


Offline
Posted: 06/28/20 02:15pm Link  |  Quote  |  Print  |  Notify Moderator

I don,t agree one battery could be weak ,it will draw the other down. you,ll get some input just wait, I,ve all ways been told mixing battery,s a no,no. sell that diesel battery and get two the same.

pianotuna

Regina, SK, Canada

Senior Member

Joined: 12/18/2004

View Profile


Offline
Posted: 06/28/20 02:17pm Link  |  Quote  |  Print  |  Notify Moderator

Be sure to wire the batteries in a balanced manner.

This is what is balanced and best for twin twelve volt batteries.

[image]

As it often doesn't cost a dime more to do this, I think it is worth the trouble.

If you wish to understand the "why" surf here:

correctly interconnecting multiple twelve volt batteries


Regards, Don
My ride is a 28 foot Class C, 256 watts solar, 556 amp hours of AGM in two battery banks 12 volt batteries, 3000 watt Magnum hybrid inverter, Sola Basic Autoformer, Microair Easy Start.

Dusty R

Charlotte Michigan 48813

Senior Member

Joined: 04/05/2003

View Profile


Offline
Posted: 06/28/20 03:02pm Link  |  Quote  |  Print  |  Notify Moderator

After we had had our mh for a couple of years, that only had one battery, I wanted to add a second battery. So I added a double throw switch, which allowed me to use only battery at a time and switched them every day. But paralleled them while driving to charge them. That kept them rather equally charged, and worked fine.

2oldman

The Q

Senior Member

Joined: 04/15/2001

View Profile


Online
Posted: 06/28/20 03:49pm Link  |  Quote  |  Print  |  Notify Moderator

Other than what that diesel battery must weigh, it would work.

valhalla360

No paticular place.

Senior Member

Joined: 08/19/2009

View Profile



Posted: 06/28/20 04:37pm Link  |  Quote  |  Print  |  Notify Moderator

Generally a bad idea. It's unlikely that they will hold a consistent charge which means the weak battery will constantly be drawing the better battery down.

If you want to take the trouble to wire them up as separate banks that are kept isolated except for charging, that's OK.


Tammy & Mike
Ford F250 V10
2008 Copper Canyon 5er
Catalac Catamaran 34'
Full Time spliting time between boat and 5er


dougrainer

Carrolton, Texas

Senior Member

Joined: 06/11/2007

View Profile


Offline
Posted: 06/28/20 04:47pm Link  |  Quote  |  Print  |  Notify Moderator

You can add mixed and mixed age batteries. But, it is not a good idea. A older battery will cause problems with the newer battery and can cause the newer battery to fail prematurely. Interstate Battery, one of the largest makers of Batteries in the USA, They have a policy, If just ONE of their batteries fail during warranty, they replace ALL the batteries in that battery bank. Now to your situation. The RV battery SHOULD be a deep cycle battery. A Chassis battery is NOT. So you will be mixing a Deep Battery with a standard Battery, which is not good. Doug

sprintstream

At Home

New Member

Joined: 05/09/2015

View Profile


Offline
Posted: 06/28/20 05:24pm Link  |  Quote  |  Print  |  Notify Moderator

I really appreciated the "balanced battery" post. Made a lot of sense. I'm thinking if I can figure out a good battery tray (yes, the diesel battery is big) that just might take care of the issue of old/new mix. Thanks for the comments.

Reply to Topic  |  Subscribe  |  Print Topic  |  Post New Topic  | 
Page of 2  
Next

Open Roads Forum  >  Tech Issues

 > Is it OK to mix battery types??
Search:   Advanced Search

Search only in Tech Issues


New posts No new posts
Closed, new posts Closed, no new posts
Moved, new posts Moved, no new posts

Adjust text size:




© 2020 CWI, Inc. © 2020 Good Sam Enterprises, LLC. All Rights Reserved.