I have had people look at me when I change my batteries too. For guys, we don't have as much options for battery storage - I figure women can use their purses or other handbags - I'm a minimal kind of guy, so usually I only store batteries in my car or every now and then in a wallet. But when my battery's in the wallet, sometimes it causes collateral damages by making a print on credit cards or other hard stuff I have in there.
Usually when I switch them in front of hearing people, they do end up watching me too. The only people who have been used to it so far were my family or old friends, although they still have curious questions sometimes. Normal hearing people areas everyone stares at me as if I had a bomb in my hand (something like that
) if I switch them in public