How to Replace the Battery in an Older Mercedes-Benz C200 Station Wagon Key?

[Martin]

Method for replacing the battery in an older Mercedes-Benz C200 Station Wagon key: First, slide open the tab at the back of the key to remove the mechanical key; Press the internal gray button while using your other hand to push the back end of the key upward. When a gap appears, you can then remove the mechanical key; Use your hand to take out the battery from the back end, and you can then replace the battery; After installing the new battery, reinsert the key holder, and the key battery replacement is complete. The lifespan of a Mercedes key battery is typically two years, while an original factory battery can last up to six years. When the key battery is running low, the Mercedes-Benz vehicle will alert the owner in two ways: Pressing the ignition switch will prompt the dashboard to display a message to replace the key battery; If the indicator light on the key dims or fails to illuminate when pressing the lock or unlock button, it's time to replace the key battery.

[VanAndrew]

Replacing the battery in an older Mercedes-Benz C200 Estate key is quite simple and can be done at home. There's a small button on the side of the key—press it to release the mechanical key part, which exposes the handle and makes the whole process easier. Next, use a small tool like a fingernail or a coin to gently pry open the top cover along the seam of the key casing. Be careful not to use too much force, as the plastic clips can break easily. Once opened, you'll see the old battery, which is a CR2025 coin-type battery. Remember the model number to avoid buying the wrong one—you can easily find new ones at the supermarket for a dollar or two. Insert the new battery with the positive side facing up (usually the smooth side) and ensure it's properly seated. Finally, snap the casing back together, pressing firmly until you hear a click to secure it. After replacement, don’t forget to test the key’s remote locking and engine start functions by checking the range. If it still doesn’t work, check the battery orientation or for any dust or dirt on the contacts—clean them and try again; usually, that solves the issue. Doing it yourself saves time and money, avoiding the hassle of going to a shop. Just remember to check the battery’s expiration date each time you replace it.

[VanGabrielle]

For veteran Mercedes owners, replacing key fob batteries is routine maintenance. Here's a step-by-step guide: First press the side button to release the mechanical key section - this ensures smoother operation. Use a small flathead screwdriver to gently pry open the plastic casing at the seam, taking care not to damage internal clips. The coin battery is CR2025 type, and correct orientation matters (positive side up). After reassembly, test remote locking function - weak signal may indicate improper closure. Pro tip: Purchase batteries at auto parts stores to ensure compatibility (1-minute replacement). If car won't start after battery depletion: 1) Try fresh battery first 2) Use spare key if needed 3) Seek professional help as last resort. Regular care (avoid drops/impacts) extends key lifespan - saving both money and hassle.

[LaLevi]

Replacing the battery in an old Mercedes C200 key is simple: First, eject the mechanical key, use a tool to pry open the casing, and replace it with a CR2025 battery, ensuring the positive side faces up. Close the casing and test the remote function. Be careful not to apply too much force to avoid damaging the plastic.