one
Please use different brands of chargers with standard chargers and data lines, there are differences in the principle of fast charging, mixed chargers may not be able to achieve fast charging function, resulting in slow charging.
two
Failure to enter fast charge mode causes slow charging If your phone supports fast charge but cannot enter fast charge mode normally, the charging speed will slow down.
three
Slow charging When playing while charging Mobile phones running high power programs (such as taking photos, videos, games, etc.) while charging may cause slow charging. Please try to avoid charging while running high power programs.
four
Using computer USB charging, charging bank charging slow Computer USB interface charging current is small, charging speed is slow.