Why can laptops use power banks as power sources?

Can a laptop be powered by a power bank?

Since the battery voltage, charging current and charging interface of the laptop are inconsistent with the power bank, the laptop cannot be charged using a power bank. This is due to differences in technical specifications.

The usual output voltage of power bank is 5V or 5.2V. The charging voltage of laptops requires at least 13.5V, and some even require higher voltages, such as 19.5V or 20V, to charge normally. Therefore, if you want to use a power bank to charge your laptop, you need to ensure that the power bank can provide sufficient voltage.

When a laptop is charging, it usually requires more than 3A of current. However, the nominal current of the power bank is only 2.1A.

Laptops on the market now all use round interfaces, and the interface styles and sizes of different manufacturers also vary. Power banks generally use USB interface data cables, which have a small diameter and cannot pass large currents.

Use a desktop computer to charge the power bank

Using a data cable to connect the power bank to the computer for charging will not have any impact on the computer, but it will have certain effects on the power bank. Influence. This is because the current provided by the USB interface of the computer is relatively small, resulting in a long charging time, and sometimes it cannot even be fully charged, which will have a certain impact on the life of the power bank. If you must use a computer for charging, it is recommended to consider using the USB interface at the back of the desktop computer case, because the interface at the back usually provides a larger current. However, with laptops, there is no way to adjust the current. Therefore, when using a computer to charge, you need to pay attention to the life of the power bank.

Is there any mobile power supply that can be used for laptops?

There is now a mobile power supply suitable for laptop computers on the market. Normally, laptop lithium batteries require about 20V for charging, while general mobile power supplies are mainly designed for mobile phones and tablets. The output voltage is around 5V and the currents are 500mA, 800mA, 1000mA, 1500mA, 2100mA, etc. Different gears. Among them, those of 1000mA and below are suitable for mobile phones, while those above 1500mA are suitable for tablet computers. There are only a small number of mobile power supplies that are truly suitable for laptops, mainly because they need to output a voltage of about 20V and need a larger current output to charge laptops. This requires lithium batteries to be connected in series and parallel to achieve such a high voltage output. The matching requirements for lithium batteries are very high, and the circuit cost is also high. Therefore, the price of such a product is generally around a thousand yuan, and the conversion efficiency is not necessarily very high.

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