My vacation last winter for a week, I brought 6 batteries, 2chargers, 6 boxes of pre filled cartos and a bottle of
juice......just in case. They could have lost my luggage, or confiscated my supplies at the airport, or lost my batteries.......oh and I brought a battery operated USB port incase we lost power. Wasn't taking any chances. In retrospect, I may have gone a little over board.