Watch out on the battery water level, sometimes they are filling it too high, splashes can corrode the underneath of your hood, and overflow can corrode the immediate metal parts underneath the battery.
The last time I had my PMS, they overfilled my battery and some splashes makes fine dots on the paint underneath my car hood. I can visibly notice those fine dots as I always keep clean my engine bay. For the overflow battery solution on top of the battery I immediately wash them with water.
Because of this incident I have put a large rubber mat on top of the battery to prevent splashes of battery solution underneath the hood.
Damn!!! I was wondering why they don't gave us maintenance free battery
