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USB ports are specified to supply a standard maximum of 500 ma (0.5 amps) current, but USB chargers range in capacity from about 300 ma to 1.5 amps. A battery can be charged faster with more current, so devices meant to charge from a USB port will probably try to draw the maximum 500 ma, but no more than that to avoid overloading the USB port. If a USB charger can provide more than 500 ma, the device probably won't take advantage of it to charge faster unless it was designed to use that charger. If the charger provides less than 500 ma, the battery will still charge, but slower than normal.
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