Battery Maintenance?

You don't need to disconnect or shut down anything when you check your water levels. `The battery will be at around 13V whether you disconnect or not. There is no shock hazard at that voltage, you can touch the battery + terminal with one hand and the - with the other hand and not feel a thing. But, as StephenH says, don't ever short out the battery + terminal to either the - or to the trailer frame with anything metallic as that would cause high current to flow and so creates a risk of burns and fires to occur. 

Originally posted by StephenH Disconnect from shore power is not needed if you go to your power panel and turn off the converter (on mine, it is the bottom circuit breaker). If you are not using metal when working around the batteries, you don't necessarily need to disconnect the cables unless you need to do so for access to the cell covers. Be sure to use distilled water when adding to your battery. That way, you don't introduce contaminants to the electrolyte.