1. The interface is faulty. Since the mobile power supply is suitable for various mobile phone applications, a common mobile phone interface is configured in the mobile power supply. If the phone port and power bank port do not work, you should find a cable.
2. Voltage or current problem. Because some mobile phones are special and use different voltages, they cannot be charged. The lithium-ion battery is 3.7V under normal conditions, and Apple's phone uses 5V. In Apple, if the voltage is not raised, ordinary lithium batteries can not charge the phone
3. Cell phones are special. Some mobile phones have their own peculiarities. They strictly control the charging voltage and current, which makes it impossible for some mobile power supplies to charge them. Try another power bank.
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Mobile power supply, mobile charger (line electricity, line charge, charging treasure, urine bag, wet nurse; Power bank is a portable charger that can be carried by an individual and can store electrical energy itself, mainly for handheld mobile devices and other consumer electronic products (such as wireless phones, notebook computers) to charge, especially in the absence of external power supply. Its main components include: a battery used as energy storage, a circuit that stabilizes the output voltage (DC-DC converter), and most mobile power supplies have chargers that are used as built-in batteries for charging.