How to Replace the Key Battery for Mercedes-Benz SLC300?
3 Answers
To replace the key battery for the Mercedes-Benz SLC300, follow these steps: 1. Press the switch on the back of the key to remove the mechanical key; 2. Press the opening button on the back to open the key cover; 3. Open the battery compartment on the left side of the key, remove the old battery, and replace it with a new one. Taking the 2021 Mercedes-Benz SLC300 as an example, it belongs to the mid-to-large-sized car category, with body dimensions of: length 4988mm, width 1890mm, height 1424mm, and a wheelbase of 2939mm. The fuel tank capacity is 66 liters. The 2021 Mercedes-Benz SLC300 features a four-link independent front suspension and a multi-link independent rear suspension. It is equipped with a 2.0L turbocharged engine, delivering a maximum horsepower of 258PS, a maximum power of 190kW, and a maximum torque of 370Nm, paired with a 9-speed automatic transmission.
Replacing the battery in a Mercedes SLC300 key is actually quite simple. First, locate the small button at the end of the key, press it to release the mechanical key part, then gently pry open the casing with your fingernail to reveal the old battery. Typically, it uses a CR2032 coin battery—pay attention to the orientation when removing it. Insert the new battery with the positive side facing up, ensuring the polarity is correct, then snap the casing back together firmly to secure the clips. Finally, test the buttons to see if they lock and unlock the doors properly, saving you unnecessary trips to the repair shop. Since keys in pockets are prone to moisture, it's recommended to replace the battery every two years. Wash your hands and remove static electricity beforehand to avoid accidental damage to the internal circuits. Detailed video tutorials are also available online for reference—doing it yourself saves both time and money.
I just replaced the key battery last week, and the steps were quite simple: First, press the small spring button on the back to release the metal key, then use a small tool or your fingernail to carefully pry open the plastic shell from the gap. Inside, you'll find a small round battery, which is a CR2032. Gently remove it, remember its appearance, buy an identical one from the supermarket, and replace it. When snapping the cover back on, you'll hear a click, and it's done. Remember to test the functionality immediately after replacement to avoid any issues due to poor contact. I think doing it myself is much faster than going to a 4S shop, and it's also a good opportunity to clean the dust from the buttons to maintain responsive sensitivity. Car keys are frequently used and can easily run out of power, so it's crucial to replace the battery early when you notice the remote isn't working properly—it saves money and gives peace of mind.
