Check the current output ("amperage") of a charger you are buying. The higher the better. The factory charger is 650mA. Many cheap chargers are around 400mA. They are very slow to charge. Some will not "keep up" while using a smartphone connected to the charger and the phone will actually discharge. My Xentris chargers are 2A (2000mA) and can charge 2 devices (USB cable required for second device). Amazon.com: Xentris 2-Amp Micro-USB Travel Charger - Retail Packaging - Black: Cell Phones & Accessories
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