Skydemon running on an iPad Mini (white, for what difference it may make) and powered by a Pilotaware.
Never had either drop out in the air (and am very impressed with it), but was playing with it on the ground yesterday and the GPS dropped out for no reason. Came back on after turning the Pilotaware off and on and reconnecting - in reality was out of GPS for no more than a minute or so which - at 115kts - isn't that critical.
I carry 2 power supplies (as well as the ship's cigarette lighter), a dual output cigarette lighter, Long and short iPhone leads and USB leads as well as my Phone (iPhone with Skydemon and inbuilt GPS) and a map.
I think i'm pretty much covered.