[Al Skierkiewicz]

If First had intended all teams to use the supplied connector, the phrase would have been worded "The 12v battery must be wired directly to the quick connect
connector provided in the kit."
Later in the robot section this rule appears...
5.8.7.2 Battery Recommendations / Cautions
To connect the 12V battery to the rest of the control system, FIRST recommends using the ring terminal contacts and red Anderson Power Products connectors provided in the Kit. This allows for a quick exchange of batteries on the robot.
We use a modular connector similar to the Anderson products but rated for 100 amps. We have seen many teams burn up the supplied connector on high current. In the event we would need to borrow a battery, we have made adapters.