Fab-oh!
Excellent! I have a, rather nice looking, very slim and light battery pack that I bought from Maplin for £10 and that I can recharge via the mains or from any powered device with a USB port and that I can use to charge virtually anything. Whereas this device is large, heavy, requires bespoke cartridges that I'll never be able to get hold of and can only charge something as long as it will draw power through it's USB port.
Can't wait.