I was wondering if you had a preference, and why...I originally ordered a manual battery. Went thru the learning curve and love it. I just purchased an auto for my M-IN-Law. I did not knowingly pick a manual, it was just the luck of the draw. I don't like the auto half as much as the manual, I don't like having to inhale forever to get a hit! But could see people I have smoked with loving them, those guys that finish a cigarette in four drags!