I don\'t want to be rude or anything, but I wouldn\'t trust things from dealextreme. And that 15Ah sounds really fishy. The box is small, how the hell do they packed so much energy?
According to wikipedia, lithium packs at most 250Wh/Kg. that thing weights 270g, let\'s suppose 250 are of battery (I guess it\'s more like 220-230g but nvm), and that thing holds 78Wh (12V*6.5A); 78*4 = 312! Wow, they do better than what general consensus states! And it\'s not by a famous brand! Pick one:
-the branded corporations are screwing us by making us believe there\'s need for better batteries, while the lithium ones can actually put out much more
-that unbranded product is a half-scam.
Actually, making calculations using size, such a high Wh might be possible, But I really don\'t know...
There are some good deals on amazon.uk, and since I\'m from europe, I think they will ship pretty fast to my place. I\'m willing to pay 30£ for a good usb power source, even if they say it\'s \"just\" 7000, it\'s still something I trust a little more than a 15000.