The charger voltage 3.88v is abnormal. Normal cell phones use 5V voltage.
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The real meaning of the charging treasure is basically made of polymer lithium battery as a storage unit. It is itself a lithium battery polymer storage device, voltage regulation through the IC chip, and then charging or storage by connecting the power line and then the stored electricity can be released.
Both ends of the battery are only 3.8, but also need to boost the voltage to output to the usb port