Once upon a time, a long, long time ago, you needed to put an actual key into a car’s door lock to get in. Today, the doors of most modern cars are unlocked by pressing a button on the key. In some cars you can even start the ignition without putting in the key. On most days, this is convenient – but what happens if the battery that powers the transmitter in the key fob dies? There’s no need to panic or even call the breakdown service. How you get in in this case varies from model to model. The necessary information is usually found in the car’s handbook, which you can also look up online. The…