How to Open a Mercedes Door with the Key When the Battery is Dead?

[DianaLee]

When a Mercedes-Benz vehicle has a completely dead battery, you can use the mechanical key to open the door or trunk. Here are some details about the domestic Mercedes GLB: 1. Dimensions: The length, width, and height are 4638mm, 1834mm, and 1687mm respectively, with a wheelbase of 2829mm. 2. Powertrain: Equipped with a 1.3T turbocharged engine, delivering a maximum output power of 120kW and a peak torque of 250Nm. 3. Interior: Features a brand-new design with an 8-inch high-resolution display at the center of the dashboard, supporting Android Auto smartphone connectivity.

[RubyFitz]

When I drove a Mercedes before, I also encountered a dead battery situation, which was a bit panicky, but the key held a little secret. On the back of the Mercedes remote key, there's a small button—just press it gently to pull out the hidden mechanical key blade. Look for the inconspicuous small plastic cover under the door handle, pry it open with a fingernail or the tip of the key to expose the lock cylinder, insert the key blade, and turn it counterclockwise to open the door. After opening the door, don’t rush to leave—the car still won’t start. You’ll need to find someone to jump-start it or call roadside assistance. Regularly check the health of both the car battery and the key battery; replace the key battery every two years to avoid trouble. Always carry the manual key blade with you, either in your wallet or on your keychain, so you won’t be stranded if the remote fails. This trick is simple yet practical.

[RachelDella]

I'm a car enthusiast and often drive Mercedes-Benz. Using the key to open the door when the battery is dead is quite convenient. The Mercedes key comes with a spare mechanical key—just press the button on the back and pull it out. There's a small cover on the door handle; pry it open to reveal the keyhole, insert the key, and twist to unlock. After opening the door, prioritize restoring power to the engine. If jump-starting is possible, do it promptly to avoid another breakdown. I recommend checking the car battery voltage every season to keep it above 12 volts. Also, test the key's remote range; replace the battery if the distance shortens. When using the manual key, handle it gently to avoid scratching the paint, and don’t force it. Don’t lose the cover—reinstall it after resetting. Following these tips makes daily car maintenance much easier.

[Hailey]

That day, as a newbie driving a Mercedes, the battery suddenly died, which was really scary. The Mercedes key has a hidden small piece; just press the button and pull it out. Pry open the small cover under the door handle, insert the key into the lock, turn it, and the door will open. After opening the door, immediately jump-start the car or seek help. It is recommended that beginners carry a mechanical key with them to avoid panic.