Car door chimes can drain your battery overnight when keys are left in the ignition, causing mysterious dead battery problems most drivers never suspect.

A hybrid has two batteries, and the bigger one matters more than most drivers realize. Here's what can happen when it fails, plus signs to watch for.

Next to buying new tires and the many maintenance items required to keep a car running, replacing the 12V battery is one of the costliest. Unlike a basic oil change that costs $35 for regular mineral ...