Yeah its a coa thing... u MIGHT deside to grab the battery termionals with your coolant wettened hands... and that HELLACIOUS 12 volt shock might seriously injure you

But the fans (in theory) can kick in at any time, because theyre electric...

Why not disconnect it? takes 5 sec mabey 30... and you dont have to worry about your mother in law trying to start the car with you under it (keep the keys in your POCKET... I kinda spent a while looking for mine... which were in the ignition the whole darn time)

~Nate