Do you use it normally? Place the external battery in a sunny location, with the solar panel facing the sun at a certain angle? If you use it correctly, it is a problem with the external battery.
1. The solar panel area is too small and cannot be used for charging at all. It only uses solar charging as a selling point.
2. Solar panels are not connected to batteries, they are just decorations.
Many solar power banks currently on the market are just hype and do not achieve the effect of solar charging at all.
But I bought a very good solar power bank. It charges faster with solar energy than others. It can also be folded and is very convenient to use.