Transporting canon camera batteries in luggge

Yep, almost a year ago, for over a year and a half worth of trips (about 20 !) I carried a camera and extra battery back and forth from the west coast to the east coast and back, in my carry-on.

Never a single question.

Now yea...just one extra...but..
Maybe four will bring up questions.
Take three, in one bag, seperated by each being in it's own bag.

Mike