I was fairly unimpressed when the Philips SCE7640 Power2Go Li-polymer portable power pack turned up on my doorstep. Huh? It’s just a box. It’s only after reading the back to find out that one charge can get you 60 hours of power that I really started to raise my eyebrows.
On reflection, it’s probably so damn expensive because it’s that much better than a normal battery. If you need power and no other battery can help, and if you can afford it, then maybe you should buy the Philips SCE7640. (Not quite as catchy)