Brought a brand new 4 x pack of ultra alkaline AA batteries. Installed them into a card shuffler, loaded cards into it and pressed the shuffle button. After about 10 seconds of shuffling there was a loud Bang from within the unit (of course the shuffle button was released immediately). Removal of the battery cover revealed one of the batteries had "crapped itself" (a technical term...) and had a heap of vaseline type goo within the battery holder. Knowing it was probably an alkaline caustic based goo I immediately scooped out the majority and washed off the remainder. As an electronic engineer I opened the shuffler to see what went bang and there is a motor and switch and nothing else to go bang (the motor was still ok) I measured the batteries 2 x 1.57V 1 x 1.54V and the "crapped" cell 1 x 0.85V. Over too many years to remember I always used duracell coppertops due to them never leaking - what have you done? It appears from all the complaints I see online, recently that your production/quality has nosedived a bit. Picture shows faulty battery to the left. Only batch type number I could find was 1009543.