May vent holes even the sealed and gel VRLA so yung hydrogen buildup should be crossed-out as cause of xplosion. Unless battery room confined sealed na usually may gas sensor. The pic shows an obvious highly modified car, most likely the cause was due to faulty electrical system or battery mounting.

Almost P1.5-2k difference ang Amaron sa generic. Yung Panasonic 18months lang warranty so i guess kahit cheaper by P2k eh 6mos off naman ang warranty.