Here are the answers to your questions about the all-night flash
It may be that the charger is more sensitive, and the indicator light on the charger is driven by the fully charged battery to consume electricity, the battery is not satisfied, and then the charger detects that it begins to charge, the charging indicator is on, and the charging indicator is turned off immediately after it is full. If you keep doing that, you keep flashing. Or maybe that's how the charger was designed. For reference only thank you.