We are currently vacationing in Hawaii. I carried tripod, level head, ball head, camera body and two lenses all in my carry on. The spare lithium batteries were in a checked bag, that’s mandatory but the one in the camera body is allowed in your carry on. No issues with TSA or Hawaiian Airlines. Never had a problem with this procedure in the past or this trip.
***Spare (uninstalled) lithium ion and lithium metal batteries must be carried in carry-on baggage only. When a carry-on bag is checked at the gate or at planeside, all spare lithium batteries must be removed from the bag and kept with the passenger in the aircraft cabin.****
I believe they have started fires in the cargo area, and are no longer allowed to be in checked bags.