“this Powerbank charged by standard USB-C; why the specification says "Maximum Input Voltage = 3.85 volts" while standard USB-C provides 5VDC?”
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The specification mentioning a "Maximum Input Voltage = 3.85 volts" likely refers to the internal battery cell voltage, not the USB-C input voltage itself. Standard USB-C provides 5V DC or higher, depending on the charging protocol used (e.g., 5V, 9V, 12V, etc.). The USB-C input is regulated internally by the power bank, and the internal battery cells typically charge to around 3.7-4.2V per cell. In summary, while the power bank's USB-C input operates with standard USB-C voltages such as 5V or 9V externally, it steps down this voltage internally to match the requirements of the lithium-ion battery cells inside.
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