How to solve the problem that the car key is dead and the door can't be opened?

Almost all cars that can be seen on the road now use remote door locks. Press the remote control to unlock the car automatically before getting on, and press the remote control to lock the car automatically after getting off. Are we used to reaching out and opening the car door? But one day, suddenly the car key was dead, and I couldn't open the door by pressing the remote control. What should I do? Here are a few ways to share with you. 1. Unlock with a mechanical key: this is the most basic operation. Insert the car key into the keyhole of the car door and turn the key to unlock it. But I'm sure some people don't know this function, and the most likely ones are these two kinds of people:-owners with or without key start function: keyless start system, no need to insert the key, just press the start button. -Car owners with remote controls who don't know the function of mechanical keys: Some car keys are very advanced. From the outside, they are beautiful remote controls, and you can't see the mechanical keys at all. So some car owners don't even know that there is a mechanical key hidden in the car key, let alone take it out for use. I don't know, so I took out my car keys and studied them. There will be surprises. This is the hidden keyhole on the car door. Even if there is no obvious keyhole, find a mechanical keyhole hidden under the door handle. 2. Replace the battery of the remote control: the battery of the car remote control key can be replaced. When you find that the car key is dead, your first thought should be to find a place to buy a battery to replace it. Moreover, many household appliances have similar replaceable batteries, such as electronic scales, blood glucose meter batteries and computer motherboard batteries, which are likely to match your car key battery model. Even if some models are wrong, the appearance is basically the same. As long as the positive and negative poles can match and the voltage is the same, there is no problem and it can be used in an emergency. After opening the car door, it is estimated that some people are worried: the car key is dead, what about the engine electronic anti-theft system? What if the car doesn't have a key to start and can't sense the car key? Don't worry, it's not a problem. First of all, the electronic anti-theft system chip of the engine does not need power supply, so as long as the anti-theft chip is present, the engine can start normally. Secondly, a car that can be started with one button needs the induction car key to start. However, many manufacturers have reserved the emergency start mode when the car key is dead. Generally, the car key is placed near the start button or at the place designated by the manufacturer, so that the system can sense the car key, and even if the car key is dead, the engine can start normally.