A crew battle is another form of a tournament. It consists of 2 teams, or crews. Each team starts out with a total stock count, which is usually a large number such as 20 stock. These stocks are then divided out among each member as the leader sees fit. Though usually it's an even distribution (in a 20 stock battle with 4 members per crew, each member would receive 5 stock), the crew leader can redistribute the stock as s/he sees fit. For example, Player A and B may have 5 stock, but Player C has 6 stock and Player D has 4 stock.
Once the stock distribution and lineup have been determined, the crew battle officially begins. The first players in each crew's lineup then fight in a 1-on-1 match with their specific amount of stock. If, due to an uneven stock distribution, one player is supposed to have more stock than another, the player who is supposed to have less stock must SD at the beginning of the match in order to achieve required stock (i.e., if Player A is only supposed to have 4 stock and Player B should have 5, then Player A must SD once at the beginning of the match).
Once one player loses all of his stock, the next player in that crew's lineup comes next. The player who won the previous match then SD's to make the number of stocks he has now the same as it was at the end of the last battle, and the next round begins. This continues until one crew runs completely out of stocks, in which case the other crew is the victor.