I am impressed with your Welsh language skills - you also have the nasal mutation correct - you put a "g" after "yn" because the following word starts with a "g".
I only speak "schoolboy" Welsh as, although my grandparents ( and indeed my wife) were/are Welsh speakers, I was educated in the English language.
I have tried recharging but for only a few minutes. I will try to babysit it charging g for an hour as you suggest, although a proven method is to use the DJI Battery Killer software that is out there...somewhere!