From what I read recently, including on a governmental aviation website, it's best to check with the airline concerned directly. It's the only way to be sure.
We're talking about France here - I realise it is barely "Western", but they are home of the on-the-edge-of-town Hypermarché where you'll be able to buy as many AA batteries as you want at a fraction of the cost in CH. (And dispose of them in a normal bin without fear of a humongous fine...)
my only experience was with spare laptop battery, as was unable to post from UK to overseas, the one time I posted it, got a letter back saying dangerous item and destroyed.
Anyway took on fight as hand luggage in the protective pack. Separated out at the security check along with other items. Was taken to one side for checking by some machine the person used and was asked if it was a spare for laptop I had.
I recall there was something about the size and amount of cells or something when reading up, but do not have that to hand now & that was to do with laptop battery.