What is the tutorial for replacing the battery in an old Mercedes SL350 key?

[MacAlessandra]

First, flip open the tab at the rear end of the key to remove the mechanical key. Insert the mechanical key into the slot at the tab position and apply slight pressure to pop open the back cover. Then, remove the depleted old battery and replace it with a new one. Close the back cover to complete the key battery replacement. Related instructions are as follows: 1. After installing the new battery, reinsert the key holder to finish the battery replacement. The lifespan of a Mercedes key battery is typically two years, while an original one can last up to six years. 2. When the key battery is low, the Mercedes vehicle will provide two types of alerts. One is when you press the ignition switch, the dashboard will display a message to replace the key battery. The second is when you press the lock or unlock button on the key. If the indicator light on the key dims or fails to illuminate, it's time to replace the key battery.