THE SEAL ON THE VENT CAPS OF THESE BATTERIES CAN BE BROKEN DUE TO A CRACK AT OR ABOVE THE SCREW IN THREAD. THE CRACK IS CAUSED BY USE OF AN INCORRECT MATERIAL IN THE PRODUCTION OF THE VENT CAPS.
THE MANIFOLD HOLES OF THE BATTERIES WERE NOT PLUGGED AND COULD ALLOW HYDROGEN AND OXYGEN GAS TO ESCAPE IN AN UNCONTROLLED MANNER.