How many 5 year olds would it take to kill Batman..

He does have explosives, electricity, etc. I think he'd survive thousands until he ran out of equipment.

Batman's gear is not sufficient for him to engage thousands at a time. He wears enough gear to take on small groups...usually less than a dozen guys.

Batman slaughters them all as he listens to "Too Many Puppies" through his patented Bat-phones.