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becous the voltage drops a little on the meter and on the cable 5.2 is the max save voltage for usb usb power supply must be between 4.8 and 5.2 v to workso if you set it at 5.2 you can lose 0.4 v 0.4v /2A = 0.2 ohm but most phones wil accept lower voltages but 4.5V at the device wil reduce charging curent
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