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Old 03-21-2016, 08:44 PM   #1
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Battery Box Mod for Group 27

I have a 2015 28' that came with grp 24 batteries. I would like to upgrade the batteries for the occasional dry camp / boondocks. I think 27s would be enough for me.

My previous AS, which I bought used, had grp 27 batteries. I'm pretty certain they modified how the cover attachment to help the 27s fit since it appeared reversed from what I have now and attached with screws and nuts (vice a hinge riveted to the battery box)

So my question....

What modifications, if any, are necessary to fit group 27 batteries in a newer model AS? I have done some measuring and it seems like it would be close but maybe possible to fit flooded lead acid group 27s but looking for first hand experience. Pics and details of your mods very much appreciated!!
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Old 03-21-2016, 09:44 PM   #2
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There are several threads which cover the issue of group 27's in the original box. Maybe someone can locate them and post the thread info.

As I recall though, what has to be done is one of the lips of the box needs to be cut off, and then the batteries can be put in sideways, first one, then it is slid to the far front (or back) and the second one then is placed in. A tight fit, especially with the cables, but it can be done, and there are photos in the already posted threads about it so you can see how it will look.

I went to golf cart type batteries, two 6 volt ones in series, but the original battery box needs to be made taller. You can see how I did mine in this thread.

http://www.airforums.com/forums/f449...-124829-2.html

My post on the 6 volt ones is #18 in that thread.

I now see that this post also started with the same question you had about group 27's in the box. So, it may help you there too.
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Old 04-22-2016, 02:35 PM   #3
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SO i was wanting to do the same thing in going to 6v batteries. Right now on the 2005 30 classic the batteries are in two boxes in front on left and right side of a-frame. The batteries in there are regular 12v marine type and there is not much room at all.

I suspect with a 6v it will be too tall. The box between the a-frame i have not measured to see if 2 batteries could be placed in there with lid open.

has anyone done this type of modify to a 31D classic.. borrowed photo from classified to show front.. mine in storage.. battery box in front on right and left.

just wanting to see how or if this can be done.

batteries and convertor under couch in front.
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Old 05-01-2016, 10:56 AM   #4
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Who has modified their battery box by raising the lid?

Please send pics and description of how you did it.

Thanks!
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Old 05-01-2016, 11:19 AM   #5
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I just did the same upgrade... Group 24 -> 27.

The only mod to the battery box was to remove the threaded rod in the center of the box that holds the battery tie-down. It was welded to the bottom of the battery box so it had to be ground off.

No need to trim the box lips, etc.. Tight fit, but they fit.

Also, for Group 27 you place them east-west (vs the standard north-south configuration for group 24s)

Picture below
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Old 05-02-2016, 08:26 AM   #6
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Quote:
Originally Posted by wulfraat View Post
I just did the same upgrade... Group 24 -> 27.

The only mod to the battery box was to remove the threaded rod in the center of the box that holds the battery tie-down. It was welded to the bottom of the battery box so it had to be ground off.

No need to trim the box lips, etc.. Tight fit, but they fit.

Also, for Group 27 you place them east-west (vs the standard north-south configuration for group 24s)

Picture below
Nice clean install.

I've seen group 31 batteries installed as well. They did require a bit of trimming on the box, but nothing major.
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Old 05-02-2016, 01:12 PM   #7
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Quote:
Originally Posted by wulfraat View Post
I just did the same upgrade... Group 24 -> 27.

The only mod to the battery box was to remove the threaded rod in the center of the box that holds the battery tie-down. It was welded to the bottom of the battery box so it had to be ground off.

No need to trim the box lips, etc.. Tight fit, but they fit.

Also, for Group 27 you place them east-west (vs the standard north-south configuration for group 24s)

Picture below
OK you have to help me here.

My battery box has an 11 5/8 opening, with ~13 1/2 inside (the flanges hang over about 1" each). I'm not sure what Lifelines you installed, but a group 27 as best I can tell is about 6.6 each which is 13.2 (too wide for the 11 5/8 opening if you turn 90 degrees as you said). Even if I install one, then slide it under the flange, 5.6" of the battery sticks out into the opening only leaving about 6" for the second battery to slide into the box.

How did you make it fit? I've never been able to figure out how to install a larger battery without trimming the flange that the hinge is on and reinstalling the hinge so it does not overlap the battery box opening.
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Old 05-03-2016, 05:23 PM   #8
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you need to remove the lid of the battery box (drill out 3 rivets, but no need to cut the lip). You sink one in and push it all the way to back. Then slide the second one in at an angle. Tight but it fits.

Got the idea from here:

http://www.airforums.com/forums/f37/...on-133372.html
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