sololady
Contributor
It might not make any sense, but you guessed "the why" exactly.
Leaving them in dive lights is a really horribly bad idea. This is part of what they are programmed to look for. Dive lights that get turned on have made their hot list (not to make a pun), so when the rules are given to the security folks, it gets put into the least common denominator: No batteries in flashlights.
I have seen two occasions where dive bags were being handled and were emitting smoke. Both were after they had been picked up by the passenger and they were heading toward the dive-op.
I heard that electric toothbush story in regards to a slightly different type of personal device
OMG!!! and I was embarrassed about my toothbrush!! Thanks for the tip on the flashlights. I'll remember to keep those batteries separate.