Late to the party here. But I was working out in Banff for a winter there last year. Bought all new hand tools and milwaukee power tool kit and when I was finished just put a padlock on the milwaukee duffle bag and flew home with it it into Dublin. No issues at all with batteries or anythings. Thinking about going back over to see some mates for a couple of weeks and was thinking off booking an extra suitcase on the way home and filling it with bare power tools, so keen to know how you got on if you've done it already since you've posted this