How well will smaller mah battery's work? I really enjoy my larger VW battery and tank but there are going to be times when I need a smaller device. A good example is we will be attending a viewing at a funeral home next week. Around these parts that involves dressy casual wear, spending a lot of time at the family's home and at the funeral home. A lot of people will be outside smoking and talking and I don't want to be whipping out a big ol device. Our local shop has smaller, shorter battery's I think they where 600mah,might have been less ..I didn't need one at the time so wasn't paying much attention no VW and I'm hoping they'll work better than a cig alike and not be as 'in your face' at serious occasions.