hey now ,, well all went great , the portable power lasted the complete show without ever needing the internal ( i still had it installed of course), i did power down at setbreak,, each set was approx. 1:15-1:30 long, soo say 2 1/2 - 3hr with out a prob.. those 4000mah will prob . last that much longer, i may pick a few up for festi season.. as far as the tip situation , i have no clue.. i know once i switched it around to the negative on the tip side it powered up peace now