How to Replace the Battery in a Mercedes-Benz E Key?

[StKate]

Steps to replace the battery in a Mercedes-Benz E key: 1. Press the button on the key and slide open the black cover; 2. Pull down the cover marked with plus and minus signs to remove the old battery; 3. Install the new battery, ensuring the positive and negative poles are correctly aligned; 4. Reattach the key cover and verify that all buttons function properly after installation. The Mercedes-Benz E-Class redefines the standards for premium executive sedans in terms of vehicle safety, comfort, and handling. It features a new six-cylinder engine paired with a 7-speed automatic transmission. The dimensions of the Mercedes-Benz long-wheelbase E-Class sports sedan are 5065mm in length, 1860mm in width, and 1484mm in height, with a wheelbase of 3079mm.

[VanNoah]

I've tried replacing the Mercedes E-key battery several times myself, and it's quite convenient! First, prepare a small screwdriver or plastic pry tool. There's usually a small gap along the edge of the key. Gently pry it open with the tool, being careful not to use too much force to avoid cracking. Inside, you'll find a round CR2032 coin cell battery. Note the orientation before removing the old one. When buying a new battery from the supermarket, make sure it's the same model and insert it with the positive side facing up. Close the casing firmly until you hear a click, indicating it's secured. Test the remote lock and unlock functions to confirm success. The battery is cheap, costing just a few dollars. Replace it every year and a half to prevent the embarrassment of a dead battery, especially in winter when power drains faster—remember to check. DIYing this has saved me a lot of money, avoiding trips to the dealership.

[Jimenez]

I often replace the battery of my Mercedes-Benz E key myself, and the method is quite simple. Locate the clip points on the back or side of the key, gently pry it open with a thin credit card (avoid using sharp objects to prevent scratching the plastic). The battery is a CR2032, with the positive side marked with a + sign—make sure not to place it upside down. Purchase a reliable brand of new battery from a nearby store to ensure durability. After installation, close the cover firmly and test the responsiveness. In daily use, keep the key dry to avoid moisture-induced corrosion. If the remote control range shortens, it may indicate the battery is nearly depleted and the signal is weak—replace it early. This kind of minor repair is quick, safe, eco-friendly, and reduces waste when done yourself.

[ClaraDella]

Changing the key battery is quite easy. First, I use a fingernail or plastic tool to open the Mercedes-Benz E key along the gap, remove the old CR2032 battery, check the positive and negative markings to avoid incorrect installation. The new battery is available in supermarkets and takes only one or two minutes to replace. Press the shell tightly and test for successful unlocking. Don't worry about breaking it—I've changed it many times with plenty of experience. Just handle it gently—it's a simple, convenient, and practical life hack.