How to replace the battery in a Mercedes-Benz E260 COUPE key?

[OAmara]

Steps to replace the battery in a Mercedes-Benz E260 COUPE key: There is a button on the back of the key. Press and hold this button, then slide the back cover of the key forward to open it. The battery is located in the slot nearby. During the replacement process, be sure to pay attention to the battery model of the key and ensure the positive side faces upward during installation. After prying open the slot, remove the old battery and replace it with a new one. Then, reattach the back cover of the key. The Mercedes-Benz E260 COUPE is a mid-size luxury sedan under the Mercedes-Benz brand. The dimensions of this car are 4947 mm in length, 1860 mm in width, and 1470 mm in height, with a wheelbase of 2939 mm. The imported version of the Mercedes-Benz E-Class has a standard wheelbase, while the domestically produced models feature a long wheelbase.

[OHarmony]

Well, changing the battery for a Mercedes-Benz E260 COUPE key is something I often do myself—it's quite simple and easy to understand at a glance. There's usually a small groove or button on the back of the key; pressing it allows you to open the key casing and reveal the battery inside. The battery is most likely a CR2025 model. Remember the orientation of the positive and negative terminals, gently pry out the old battery, and avoid yanking it forcefully to prevent damaging the slot. Insert the new battery into its original position until you hear a click. Close the key and test whether the lock and unlock buttons work properly. Prepare tools in advance—just a coin or your fingernail will do; no professional equipment is needed. You can buy the battery for just a few bucks on Taobao or at a supermarket—no need to waste money at a 4S shop. Before replacing, make sure the car isn't running to avoid signal interference. It's recommended to check the battery every two years, as aging batteries can suddenly fail, which is very inconvenient when you're out driving.

[Dustin]

Oh, as an experienced driver, safety always comes first. Before replacing the battery, make sure to keep the car key away from any metal objects to avoid short circuits and sparks. First, confirm the car is not running—press the lock button, and if the light dims, it means the battery is weak. Look for a small button on the back of the key, press it, and the casing will pop open. Remove the old battery and check the label—it’s usually a CR2025 model. When handling the new battery, avoid touching the negative side, and gently place it in, pressing firmly. After closing the key, press the buttons a few times to test the response. If it doesn’t light up, the wiring might be loose, so carefully reassemble it. Always keep the key dry and away from high temperatures—I once had a circuit burn out after getting wet in the rain. It’s best to buy genuine batteries for stable quality—don’t cheap out on knockoffs to save money and end up with more trouble. The whole process takes just a few minutes—saving money and learning something handy.

[SanFaith]

I've replaced the dead battery several times. Just press the small button on the back to open it, and you'll find the battery inside. The commonly used battery model for Mercedes is CR2025, which can be purchased at hardware stores or online for just a couple of dollars. Gently pry out the old battery without damaging the contacts. Install the new battery with the positive side facing up and press it firmly in place. Close the key and test the unlock function. Remember to prepare simple tools like your fingers or a thin piece. Also, check for any water damage marks on the key to avoid bigger issues.

[LaEvangeline]

I've changed my key fob battery myself to save money and hassle. There's usually a sliding button on the back of the key - push it to open the case, remove the old battery and check its model like CR2025. Buying a few new batteries online is very cheap, just make sure to insert them with correct polarity and secure them properly. After replacement, test the key by pressing buttons multiple times to ensure it works. If it doesn't function after battery change, dust might have entered the key interior requiring cleaning. Keep the mechanical key ready as backup for emergencies. Doing it yourself saves dozens in service fees - quite satisfying.