You can use AAA batteries instead of AA by placing a small piece of tinfoil in the gap. : r/lifehacks
AEROCELL - YouTube
Bag of Small Domestic Dry Cell Batteries, Old Trash To Recycle. Isolated on White. Alkaline . Europe, UK AA and AAA Size Editorial Stock Image - Image of discarded, electric: 144020719
Without a strong European battery industry, car manufacturers may leave the EU | European Economic and Social Committee