The car battery’s a distant cousin to your old science-class penny-and-lemon unit. Here’s how you test “cous.”

Battery Service Safety

Sure, it’s happened to a lot of us. Some of us remember seeing the spark, some of us don’t. We all agree that it happened so fast, we were lucky to keep our wits about ourselves. Although we may joke about it today, those of us who’ve been splashed with battery acid and/or battery fragments will never forget the bang nor the stench and the burn of the acid nor the panic we felt as we ran for the water.

Admit it, many of us owe our eyesight to the grace of our favorite deity. No more, no less. Just be careful next time, ’cause lightning really can strike twice.