1. Internal charging circuit failure. 2. The battery is faulty.
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The portable WiFi router will inevitably be bumped during use. If there is virtual welding in the internal circuit, it is likely to cause the solder joint to fall off and thus cannot be charged. It is also possible that the electronic components in the circuit are damaged, resulting in a failure to charge. At this time, you can find a professional to open it for inspection.
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At present, the number of charge and discharge of the battery is capped, and the battery also has a service life. When the battery is used for more than a certain number of years or the number of charge and discharge is very high, the battery may suffer from rapid loss of power after charging, or even the problem of not charging. It's time for a new product.