First of all, you need to use a charger or solar panel to charge it.
If you use a charger, it depends on how much current the charger uses. If it's a 1A charger, it will take almost twenty hours.
If you use the built-in solar charging panel to charge, I have experimented in the past. When the sun is very good, it can charge 100mAh in almost a day. It will take at least 200 days to fully charge. He still needs it. The weather was good every day for two hundred days. If you take into account cloudy and rainy days, it is estimated that it will not be fully charged for a year.
Okay. On sunny days, the solar power bank can be placed on the windowsill for charging, and on cloudy days, it can be charged directly with mains electricity. Compared with ordinary power banks, solar power bankshave more solar charging functions. They use green energy, are environmentally friendly and pollution-free, and are particularly suitable for travel enthusiasts. I would like to recommend the Quadruple Power battery that I use. The high-power battery board charges very quickly.