1. In theory, the 5V power supply output by the charging bank can charge the Bluetooth headset;
2. However, due to the design problems of its own internal resistance and reversal circuit, the output voltage is difficult to meet the charging standards of some electrical appliances with built-in small-capacity batteries, resulting in the charging device being in a protected state, resulting in the Bluetooth headset being unable to charge;
3, the general charging head or charging bank no-load voltage will be higher than 5V, when the access demand for high current of the lower charging device voltage will be reduced to the specified range, if the lower charging device required current is too small, then the voltage drop is too small, the lower charging device will refuse to charge due to overvoltage power failure.