Ok.. I agree you wanted to let us know the charging is low and connect a charger. But showing the annoying error message every few minutes even when the charger is connected and until the charge reaches 20+% is ridiculous. Further more the pop up is so big that it interfere with whatever is on screen.
How to reproduce :
Disable power saver, turn on screen and do something while charger (wall socket or power bank) is connected. Ensure battery is less than 20%.
OPEN TESTER 