Just got back from Namibia last week. Departed Houston, went to Atlanta, then to Johannesburg aboard Delta. Then South Africa Airways from Johannesburg to Windhoek, Namibia. Two weeks later, did a repeat back to Houston.
I had packed the Anafi (without a battery) and the controller in checked baggage. I took five batteries and kept them in my backpack as my carry on piece. Going through Customs, TSA, etc., not one problem, not one question. I did not have to remove them from my backpack at any point during the process of boarding/departing an airplane or airport.
They didn't ask, I didn't tell.
I had packed the Anafi (without a battery) and the controller in checked baggage. I took five batteries and kept them in my backpack as my carry on piece. Going through Customs, TSA, etc., not one problem, not one question. I did not have to remove them from my backpack at any point during the process of boarding/departing an airplane or airport.
They didn't ask, I didn't tell.