I removed all the stock boxes/vents etc. Built a wood tray that holds 2-6 volt and 2-12 volt batteries tightly so they do not move around. No covers. No issues in 3 years. The covers are nothing more than a PITA to remove every time you want to check the water level. I believe the batteries do not gas off much at all and if they did the front compartment is so leaky that it would dissipate a problem.
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