Perhaps we can use this as an excuse to ban Axe body spray?
(If I were actually concerned, I'd spend more time worrying about laptop batteries, not lithium AAs. Even unmodified, they are just plain bigger, plus a Li-ion/Li-poly battery shows up as a more or less opaque outline under x-ray scan, and modern laptops are stuffed to the brim with the things. It would be pretty trivial to keep enough unmodified battery to allow the laptop to turn on and operate normally for a short period if challenged, while rigging the rest to either burn in a zesty lithium fire, or replacing the rest with something similarly metallic and even zestier, like thermite, no organic odors to tip off the dogs or expensive sniffer machines... Extra credit, of course, would be awarded to anybody who could conceal an explosively formed penetrator as a 'unibody' metal chassis component; but that's overkill.)