... to use the USB standard all chargers have to meet a requirement for voltage,
etc so they will all work. the ipad charger cube is capable of carrying more
current (ie, amperage) so it will meet the ipad requirement (larger, higher
amperage battery) as well as the iphone, ipod requirement, so they will work
very well on all the "i's". To use the iphone or ipod chargers on the ipad will
still work but may take a bit longer to charge. Treat them all the same and be
thankful you have more than one in case one fails...
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