Originally Posted by Flybob
If you are talking about checking water levels visually, then it is not a bad idea to at least insure that power to the battery is off as opening the fill ports can release hydrogen gas and an accidental short in an enclosed area could cause a problem.
The battery boxes on Berkshires, a class A motorhome are extremely well ventilated. It is my experience that to check water levels does not require anything more than opening the cabinet door and looking at the battery's water level. Make sure to fill with distilled water.
2015 XL 40QL-60
2015 Jeep Wrangler Unltd. Sahara
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