When you leave your car parked for a while, it enters "sleep" mode, but it isn't fully off. Certain systems, like alarms, keyless entry receivers, and onboard computers remain active. Modern vehicles, ...

If you've driven cars long enough, you can relate to our readers' stories about cars with dead batteries. Since few people get into the driver's seat without intending to drive, turning the ignition ...

Car batteries can lose charge when not in use thanks to what's called parasitic drain. Here's a look at why that happens and how you can avoid a dead battery.