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Old 02-21-2021, 08:41 PM   #1
Ed C
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New Batteries Don't Fit

Just purchased replacement batteries for my 2019 3700LK. OEM batteries would not hold a charge, even with OEM solar system. Unfortunately, the new batteries do not fit in the plastic box, as they are just a tad too large. I plan to fabricate a plywood box, and affix it so that it does not move around in transit. Has anyone else experienced this? If so, what was your "fix?"
Ed and Dianne (and Clancy, the red Poodle)
2019 Montana 20th Anniversary Edition 3700LK
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Old 02-21-2021, 08:43 PM   #2
AZ Traveler
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There are many different size battery boxes you can buy and install.
Zack and Donna plus Millie and Ranger

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Old 02-21-2021, 08:50 PM   #3
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If you can't find the right size battery box from an RV or auto parts dealer look at a marine dealer they have all kinds of sizes.
Dick, Joyce, Diego, Picatso and Gustav
2017 3720 RL, and 2013 HC 343RL
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Old 02-22-2021, 09:36 AM   #4
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When I upgraded to 4 6v batteries I just bought a tote from home depot, screwed it to the floor of the battery compartment, cut a hole in the lid and attached the vent hose. It works great, for less than $30.
2020 294RL
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Old 02-22-2021, 12:06 PM   #5
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Smart idea.
2019 Keystone Montana 3560RL
Truck: 2020 Chevy Silverado 2500 HD Duramax: Firestone airbags, Curt gooseneck & an Anderson Ultimate 5th. wheel hitch. USMC combat vet & retired LEO. Robert & Anika
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Old 02-22-2021, 01:52 PM   #6
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Here's a company that specializes in RV battery boxes:

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Old 02-22-2021, 06:36 PM   #7
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If I change the battery box to accommodate the two 6v true deep cycle cart batteries, does the vent drain down or up? And is there any real need to be anal about sealing the cover of the box where the wiring exits? I noticed on the original box, the sealing looks really tight.
2018 Montana 3791RD
2017 Ram 3500 DRW 6.7 Cummins Aisin, B&W RVK3600
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Old 02-23-2021, 05:46 AM   #8
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Lead Acid batteries can give off gases and require venting to be safe. AGM do not. I don't think Lithium do not either, but I've never owned them, so not sure. It really depends upon your batteries themselves with this. Our vent is attached to the top of the battery box. Here's a link to more info.
Robert & Diana McNeal
2019 Montana Legacy 3791RD 20th Anniversary Edition
2014 F350 4x4 6.7L SRW
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