The nominal voltage of the power supply is much higher than the voltage of my laptop battery, so it won't happen?

　　First of all, you need to know that the power supply to the notebook is different from the battery power supply to the notebook.

　　The battery is powered, the output of the battery is pure DC, which is very clean. The voltage of the battery is neither possible nor required to be designed to be very high. The chemical characteristics of the lithium battery determine that the output voltage of a cell can only be around 3.6V, so Many batteries use three-stage series connection, and 10.8V has become a very popular battery voltage. The nominal value of some batteries is slightly larger than the integer multiple of 3.6V, such as 3.7V or 11.2V, etc., in fact, to protect the battery.

　　Power supply, the situation is a bit more complicated. First of all, the added voltage needs to be further stabilized and filtered to ensure stable operation when the power supply performance is not very good. The other way to charge the battery, the part that supplies power to the notebook is the same as when the battery is powered, and the part that charges the battery needs to be added to the cell through the battery's charging control circuit. The control circuit can be very complicated, so the power supply voltage It must be greater than the cell voltage to have sufficient capacity to supply each unit of the charging control circuit. The final voltage added to the cell will never be the nominal voltage of your power supply. Don't worry.

　　A suitable power adapter requires safety certification, and a power adapter with safety certification can protect personal safety. To prevent electric shock, fire and other hazards.