As a photographer, it can happen sometimes that one a whole day very excessive use phone or tablet, and in the last few hours without power is there. Enough stuff you then usually carry around with themselves. The compact and quite lightweight spare battery of Ravpower cometh as called. The specified performance is okay, I get so an iPhone charged a number of times and just sometimes an iPad and iPhone simultaneously. Those who work on location with Eye-Fi / Wi-transport and ShutterSnitch example, knows empty i-Devices to satisfy. With my "Ravvy" which is now no longer a problem. So I come by the longest day. And if I leave the iPad, I'm just using the iPhone even without power over a whole week. What's hot!