Lahotka,Welcome to the TDR my friend,sorry to hear of the battery problems,sounds as if your dealer fixed the problem however I understand your concern of future problems,I would get a box of baking soda and wet the area down so it will stick then sprinkle the baking soda in the battery box area,let it soak a while and if you can get a bristle brush and scrub it a bit then rince it clean. The baking soda will nutralize the ph of the battery acid.
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Kevin

Kevin