Surprised that it has holes in top cover

I bought this to use in an open 14' boat with a 25HP Honda outboard. The two areas where the cables can go in when the top is tightly fastened with the strap should provide adequate ventilation, but there are two dime-sized grids that are directly open to the rain and/or spray from boating, which eventually would fill and flood the battery box. Not sure why this is designed thus, will just have to check it frequently.

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