Better in carryon in Asia
In Asian airports and their airlines, I find they screen for batteries and often call them power banks and set top limit at 20,000 mAh that is permitted on their flights. I never put any type of battery in my checked luggage as airports scan and can inspect your checked bags after you dropped them off. I've been stopped at security in Asian airports after my carryon had be scanned to inspect my battery. At least if they want to confiscated it I can question it or would know they took it.