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Old 02-13-2017, 01:24 PM   #1
Senior Member
Brand: Thor Motor Coach
Model: '17 Hurricane 34F
State: Missouri
Posts: 232
THOR #6040
Battery compartment corrosion

New Hurricane, I noticed discolored spots on the ground below my battery compartment. Looked, and the underside of the metal compartment floor has spots of corrosion.

Looking inside the compartment, and there are a lot of areas of corrosion on the metal floor and on other metal surfaces inside the compartment. What can likely cause this.

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Old 02-13-2017, 02:57 PM   #2
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Brand: Thor Motor Coach
Model: Hurricane 31S
State: Texas
Posts: 1,688
THOR #6411
Batteries contain a large volume of water and sulfuric acid. During daily temperature changes, moisture condenses on the outside of the batteries and runs down the sides and under the batteries. The batteries out-gas some sulfuric acid fumes during charging. That mixes with the water and you have serious rust and corrosion. AGM or any type of VRLA batteries will solve this problem. If you choose to stick with flooded lead acid batteries, then enamel paint plus a plastic battery tray will help.

Jim & Roy Davis
2016 Hurricane 31S
1961 Rampside in tow
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Old 02-13-2017, 11:59 PM   #3
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Brand: Still Looking
State: Alabama
Posts: 333
THOR #3789
Wash them down with some baking soda and water every so often.
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Old 02-14-2017, 12:24 AM   #4
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Brand: Thor Motor Coach
Model: 2017 Windsport 29M
State: Indiana
Posts: 3,688
THOR #5196
You'll need to remove the batteries, clean area with baking soda and water, sand, and repaint to stop the corrosion. I've seen people use the bottom half of marine battery boxes, once saw someone who used plastic dish pans, anything to isolated the battery from contact with the metal. Instead of paint you can also use the Spray and Seal stuff advertised on tv, it's actually pretty good stuff!
USMC Veteran
FMCA 101070S

Dave & Myra
One day your life will flash before your eyes,
make sure it's worth watching!
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Old 02-14-2017, 11:03 AM   #5
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Brand: Entegra
Model: Entegra Accolade 37TS
State: Virginia
Posts: 3,940
THOR #1469
Repaint the battery compartment with Randolph 345 and never worry again, provided you correctly clean and prep the area.

US Army (Ret)
2020 Entegra Accolade 37TS
2019 Jeep Grand Cherokee Trailhawk (Toad)
FMCA - F432054
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Old 03-10-2017, 03:05 AM   #6
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Brand: Still Looking
State: Arkansas
Posts: 4
THOR #6740
If this battery compartment is in or below the cabin or living compartment your battery may be generating hydrogen sulfide gas which can be lethal. This gas is very corrosive and also flamable. If you smell rotten eggs do not drive the vehicle.

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