Welcome to the site !!
I use the plug you are referring to on my 450X as well as my ATV , what is nice about it is by using the same plug (covered male ,exposed female spades) you can leave it hanging without fear of it shorting out , and you can plug in the opposing end to a accessory and not have to lift the seat , then also have the added bonus of being able to charge without doing anything except plugging it in ....... The limitations are the output of your charging system , as Ray mentioned , if the appliance you are trying to connect is a higher output than your system , then you can overheat the plug/wire and cause it to short out and/or fry something in the system , including what you plugged it into
So the plugs work great , you just need to be aware of voltage and amp draw before using it , especially if it is more than just a minute or so .....
This is the plug I am referring to