In reply to The Lemming:
> (In reply to The Lemming)
>
> Some of these power packs have two USB ports, one with 1A and another with a 2A rating.
>
> Does it make a difference which port I charge devices with, as it am I likely to fry something?
What should happen is if you plug a device with a big battery like an iPad in which would normally have a 10W charger into the 1A port there will be a negotiation between the device and the charger and it will either take a long time to charge or not charge at all. If you plug a small device like a phone into the 2A port it should do the same as if you plug it into the 1A port.
HOWEVER, some of these battery packs are made by total cowboys trying to shave out every possible cost and I would not bet on them implementing the USB spec properly if it cost an extra dollar worth of silicon. Therefore, unless the documentation explicitly said it was OK I would be careful to use the 1A port for small devices and the 2A port for big ones.