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Old 08-31-2016, 09:20 AM   #1
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quick house battery question 2015 Rev

I want to add a battery , we only have one - we bought the motor home end of 2015 but it was manufactured in late 2014 . I would like to just add a cheap similar battery in size and then when they need replaced in a few years get two new better batteries. - should it work ok to do this even if not perfect ?
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Old 08-31-2016, 01:50 PM   #2
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I would not do that unless I was only going to use one at a time on an isolation switch. (which would be a pain)
Replace both and they will last for several years. Even with the same make and model battery they should be with in 6 months of each other for maximum performance.
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Old 08-31-2016, 02:03 PM   #3
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If you currently have one battery and are replacing it with the one in the picture I see no reason not too. More important is that the battery is maintained properly.
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Old 08-31-2016, 02:08 PM   #4
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just hate to junk this perfectly good expensive battery so I can buy two new ones ? wish I could find another one just like this and same age .
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Old 08-31-2016, 03:56 PM   #5
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If you currently have one battery and are replacing it with the one in the picture I see no reason not too. More important is that the battery is maintained properly.

The OP said " I would like to just add a cheap similar battery in size and then when they need replaced in a few years get two new better batteries. -"

To answer your question, you need to keep the two batteries in balance, otherwise they will not be able to give you the desired performance you are looking to get by adding one.

So, yes you can add a "cheap" battery, but, you will not get the best outcome, because they are not matched, and thus performace will be diminished from what you might expect.
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Old 08-31-2016, 04:52 PM   #6
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If you currently have one battery and are replacing it with the one in the picture I see no reason not too. More important is that the battery is maintained properly.
no - this one in picture is the one it came with
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Old 08-31-2016, 05:25 PM   #7
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If you just "add another 12 volt battery" (as long as you wire it properly as in the attached graphic), you will get more capacity than just one battery.

However, you won't get the sum of the two capacities; you will get less (maybe a lot less). One battery will work much harder than the other, be charged and discharged completely more often, and fail earlier than it would if you left it alone.

You would then have a dead battery and a partially ruined battery. You will STILL have a "good" battery you will need to throw away.

Better to wait until you are ready to bank a new duplicate pair (IMO).
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Old 08-31-2016, 06:11 PM   #8
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Google this:

Perko 8501DP Marine Battery Selector Switch

With it installed, you can choose either battery to use and/or charge. As already mentioned, don't connect both batteries together ("BOTH" position of the switch) since their will be an unbalance.

You just have to keep track of battery usage to make sure that they each get recharged properly. Same idea a using 2 propane tanks and switching over when one is depleted.
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Old 08-31-2016, 07:24 PM   #9
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ok thanks all - I'll either just keep using one for awhile or replace it with 2 new and both the same .
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Old 08-31-2016, 07:35 PM   #10
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ok thanks all - I'll either just keep using one for awhile or replace it with 2 new and both the same .
We have the same 2015 REV RB. It came with the same single AGM battery also. There is room for two, and I think the new ones come with two. I was told that you can't mix an old battery with a new one. When the original one goes out, buy two new ones that are manufactured at the same time. Also go for AGM's because the battery compartment is too difficult to get to the top to fill a flooded cell battery with water.

Tom D 2015 REV RB Orlando
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