The LED battery indicator lights will flash sequentially while charging.
This mode is specifically designed to charge low-power accessories like wireless earbuds, fitness trackers, and smartwatches, preventing the power bank from automatically shutting down due to low draw. aukey pby37 manual
Ensure your wall block outputs at least . Standard 5V phone blocks will take over 10 hours to fill a 20000mAh cell. The LED battery indicator lights will flash sequentially