Now that incandescent bulbs are on the way out, LED bulbs ... draw 8 to 12 watts. Imagine you see two LEDs sitting on the shelf at the store, each of them branded as a 60-watt replacement.

Between powering lights, computers, infotainment systems, electrical accessories and your engine’s starter motor (even on most hybrid-electric vehicles), your little ol’ 12-volt battery has its work ...