The picture they have of a backpacker with a liter bottle on one side of his pack and a Trontium on the other looks nice and self-sufficient but he's got all that extra weight to lug. Is he going to be living in the wilderness for 10 days whilst writing a novel on a laptop or tablet? That's about the one use for this battery that I can foresee.
For the average Joe, this thing isn't going to be doing much traveling. And if it's not traveling, it's sitting on a counter not too far away from a wall socket.
As for taking it on a plane -- most plane trips aren't long enough to warrant a super-battery. Devices these days can last 6-8 hours between charges, and if they don't, there are all sorts of cheaper solutions. I have a $20 lipstick-size battery that's good enough to keep a phone or tablet in business for a few extra hours.
I'm afraid I just don't see the point of this product as it is. But I hope they keep doing research, and learn how to shrink it down until it's truly portable.