[Al Skierkiewicz]

The battery is capable of 600 amps at full charge. No matter where the battery is or at what stage in wiring it might, one of the terminals should always insulated. Jon's practice at regionals is recommended for all inspectors and teams. I will watch you insulate bare terminals while I carry on inspection or I will do it for you.
600 amps flowing through the internal resistance of the battery (0.011 ohms) works out to nearly 4000 watts. Yes, it is enough to weld a dropped tool (or wire or a necklace, bracelet or watch band) in place across the terminals. The result is a lot of heat, possible flame, escaping gas and acid, ruptured case and in rare cases, explosion.