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With an iPad you need to use the supplied charger; an iPad won't charge from a standard USB charger, although an iPhone will. The iPad requires 10W to charge (5V @2A) compared to the USB standard of 5V @1A. The reverse is not true, though: the iPad charger will charge standard USB devices.
All my other devices, I just use whatever USB charger is closest at hand. I have a couple of them permanently plugged into wall sockets - one in the kitchen and the other in my bedroom - and just connect whatever device requires charging.
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