Unless you're using only Apple devices, its unwise to trust the USB ports of your laptop to charge your mobile devices within a reasonable amount of time. They'll do the job if you don't have your mobile device's original charger with you, but it will take a long time.
Use your original charger
Our tests show that you'll get the quickest charge from the charger that came with your device. However, if you want to take only one charger with you on a trip to charge both an iPhone and an iPad, choose the more-powerful iPad charger instead of the weaker iPhone charger.
For other devices, use a charger that the manufacturer has tested and verified with your particular mobile device. Most charger manufacturers produce a compatibility list for their products.
Some new technologies on the horizon could speed things up even more. For example, Qualcomm recently announced the new Quick Charge 2.0 standard, which will allow the charger to send a hefty 4 Amps (4000mA) of power. To use this technology, you'll have to work with a special charger and a phone or tablet that supports the standard.
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