All chargers are not created equal. I have 3 different Verizon branded chargers that came with Verizon phones. Two are USB, and one is a straight wire. The USB chargers are drastically slower to charge than the non-USB charger. At this point, I don't even remember which charger came with which phone....but one of the USB chargers, will allow the battery to drain if the phone is being used. It takes several hours to fully charge a low battery. The others will do it in a couple of hours.
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