You have to compare the wall charger output with the portable battery charger output. For instance, if the wall says output is 5 volts but your portable battery says 2.5, then the portable battery will take longer to charge the phone. You don't want one that will output more than your wall charger though. Read the fine print on both the wall charger and portable charger.
Even though its only 600 ma , it only says slow charging for like 3/6 seconds then disappears and charges so fast that it only take about 25 mins to fully charge . Probly from 20 something to 100 in 25 min
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