Same for me - my iPad can get through the longest gig with no problem (as long as I remember to have it charged of course) ... I use it (sometimes 2 of them) with no power cables involved, at gigs . . .

-Jim
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Genos / Tyros5 / HK Lucas Nano 600 / FTB Maxx 40a / EV ZX1A / Rock'n'Roller cart / Hauptwerk virtual pipe organ / misc other audio & music toys