How to Replace the Battery in a Mercedes-Benz SL280 Key?
2 Answers
The back of the key has a button. Press and hold this button, then push the back cover of the key forward to open it. The battery is located in the slot nearby and can be replaced directly. During the replacement process, it is crucial to pay attention to the battery model. Most Mercedes-Benz key batteries are of the 3V-CR2025 type. After removing the old battery from the slot, replace it with a new one. Next, reattach the back cover of the key. Once installed, the battery replacement is complete. More details are as follows: 1. The lifespan of a Mercedes-Benz key battery is generally two years, while the original factory battery can last up to six years. 2. When the key battery is low, the Mercedes-Benz vehicle will provide two types of alerts: one is when pressing the ignition switch, the dashboard will display a message to replace the key battery. 3. The second alert is when pressing the lock or unlock button on the key. If the indicator light on the key becomes dim or does not light up, it is time to replace the key battery.
I've changed the battery in my Mercedes SL280 key several times, and it feels really straightforward. There's a seam on the back of the key—just gently pry it open with a small coin or your fingernail. Be careful not to use too much force, as the plastic casing can crack easily. Inside, you'll find a round CR2025 battery, a common type. Make sure not to install it upside down; the positive side should face up. When removing the old battery, remember its orientation. After installing the new one, test the key by locking and unlocking to ensure it works smoothly. The battery typically lasts about a year and a half, but frequent use can drain it faster. I recommend DIY replacement to save time and money—a new battery costs just a few bucks and is available at electronics stores. To prolong battery life, avoid placing the key near hot objects or your phone, and check it regularly to prevent sudden failure that could affect your driving.
