I did a cursory look but did not see the subject discussed. If I overlooked it sorry. I am looking for something to provide backup or emergency power for my 64GB IPAD2 in the event that I don't have access to a power port on my longest leg of an airline trip to the other side of the planet. I have both the auto adapter and standard charger but no guarantee that I will have seat near a power point. I'm looking for quality/endurance over price.