Disadvantages:
- A cord is provided with battery for charging and loading devices, but to recharge my iphone 4S I have to use my normal laptop charger because the cord does not have the elongated end iphones .. ..
- To charge the battery must be necessarily a USB plug adapter with you, and charge device must necessarily an 'input' as those kindles (small elongated a little, right on one side and rounded on the corners of the other). So if I want to take him with me to charge my iphone later in the day, I must take my laptop charger, not the cord ...
It will be very useful to me when I travel by car with my GPS portable march all along since my arrival GPS has always eaten my battery, so the return is blind! :)