Shun Cheung , Aug 20, 2007; 07:10 p.m.
I have flown many times with DSLR batteries with no problems. However, if you also have the power cord for the charger with you, sometimes it could get their attention. Apparently a power cord could be a component in some sort of bombs.
Once I traveled with my wife, and she had a lot of cables for her video camera. They ended up hand checking her entire carry-on bag.