Just imagine: You're pretty sure you have a dead car battery that needs replacing, and you want to take a look under the hood to see what's going on.

You usually won't need to go so far as to actually start your engine; simply connecting your car's electrical system to a booster pack or another car with a good battery should allow you to pop ...

If you can't get your modern car unlocked, it's possible you have a dead battery. But you might actually have a dead key fob instead, which can be just as frustrating.