Anyone who has children knows the astounding quantity of batteries a family can go through. There are weeks where it seems I change different batteries daily - much to our children's fascination. Even our 22 month old is familiar with batteries, and knows that they are the "key" to making some of his favorite toys work. "Flashlight needs babberies, Mommy....Hopcopper (helicopter) needs babberies..."
Last night, my husband's car died. Turned out it needed a new battery. As the kids and I went to pick up my husband - our 3 1/2 year old asked where we were going. I explained we had to go the shop to pick up Daddy because his car needed a new battery. After which he asked rather incredulously, "just ONE battery?!!"