Tutorial on Replacing the Battery for an Older Mercedes-Benz R350L Key

[AnastasiaDella]

Mercedes key batteries typically last about two years, while original factory batteries can last up to six years. When the key battery is low, the Mercedes vehicle will alert us in two ways: first, when we press the ignition switch, the dashboard will display a message to replace the key battery. Second, when we press the lock or unlock button on the key, the indicator light on the key will dim or stop lighting up, signaling that it's time to replace the battery. Below are the steps to replace the battery in an older Mercedes-Benz GLA key: 1. Slide open the tab at the back of the key to remove the mechanical key. 2. Insert the mechanical key into the side slot of the key, press the internal gray button, and with the other hand, push the back end of the key upward. When a gap opens, we can remove the mechanical key. 3. Then, manually remove the back end to access and replace the battery.