Motorized Tomica World cars advice

I recently bought 2 Motorized Tomica World cars that are still bnib... I don't know when they were released, but I am assuming that they are fairly old. I am concerned that they say "batteries included" on the box!! Do you think I should sacrifice the packaging to get those old batteries out of them before they corrode ruin the cars?( if they're not already ruined)
Does anyone know when they released?