Look, if somebody is dumb enough to plunk down several hundred dollars on a battery without verifying the most basic elements of connectivity, then I am going to let them know about it because, 1) it is a mistake they need to learn not to make in the future, 2) because they can serve as an object lesson to help others do the same, and 3) having their face catch on fire as a direct result of such an elementary mistake is not out of the realm of possibility.
They also failed to mention the wires on the original battery for comparison, and whether or not it contains a switch.