Traditional power banks used to charge smartphones are not suitable for laptops. This is because you need to get a more powerful device for them to work.
First of all, you should make sure that the battery you have is compatible with your laptop. Most often, a power bank connects to laptops using USB-C, but older models may have a different connector.
To charge a laptop, the minimum power of the external battery must be 20,000 mAh. Also pay attention to the size of the device: if it is small, it most likely has too little power.
If you buy a power bank from the store offline, take your laptop with you to check compatibility immediately.
Source: Ferra
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