What is the battery life on an iPad air or android style tablet?.....Im in testing mode to see if I want to switch from my note pad laptop to some kind of tablet... I just dont trust using a device on stage on a 4 hr gigs just using battery power versus AC? I make lightning fast selections on mp3's, word files when needed, etc, etc, changes with my laptop now.. .....dont know using a tablet would be any better on just a flat screen propped up on a stand? vs keys..and how strong are connections audio etc,.. 1/8" I assume?

btw can you hook a tablet to a S950 for a lyrics display etc also some how?..