How to replace the battery in a Mercedes-Benz R320L diesel version key?
3 Answers
Mercedes-Benz R300L key battery replacement method: First push up the marked switch to remove the mechanical key, open the key casing, then pry out the old battery and replace it with a new one. The Mercedes-Benz R-Class luxury sports tourer features multiple characteristics including permanent all-wheel drive, advanced axle design, rear air suspension, and a long wheelbase. The Mercedes-Benz R300L is equipped with a series of dynamic performance systems designed to enhance driving comfort, such as using double-wishbone suspension to secure the front wheels for improved driving stability and handling performance, adopting an advanced four-link structure for the rear wheels, and making rear axle air suspension a standard feature. In terms of body dimensions, the Mercedes-Benz R300L measures 5173mm in length, 1922mm in width, and 1661mm in height.
I've been driving a Mercedes-Benz R320L diesel version, and changing the key battery is a common task. Don't worry, it's super simple. There's a small gap on the side of the key. Use a small screwdriver or a coin to gently pry it open, and the shell will come off. The battery inside is usually a CR2032 coin cell. After removing the old one, buy a new identical one and install it, making sure the positive side is facing up and not reversed. When closing the shell, listen for a click to ensure it's securely locked, then press the remote button to test if the unlocking function is restored. I keep a few high-quality spare batteries in my car because the original ones often run out after two years, and cheaper replacements tend to drain faster. It's advisable to regularly check if the key buttons respond slowly—replacing them early saves trouble. Also, don't forget to carry spare batteries when traveling; it can be troublesome if the battery dies while parking in an unfamiliar place.
I've been using the Mercedes-Benz R320L for a while, and when the key fob battery died, I easily found a solution online. The YouTube tutorial was straightforward: hold the key in your hand, use a small knife or coin to wedge into the edge gap and pry open the shell. Remove the old CR2032 battery and replace it with a new one—make sure not to get the battery model wrong, or it won't work. After closing it, press the buttons to test; if it doesn’t work, it might not be installed properly, so try again. I often find the buttons more responsive after changing the battery, and buying name-brand batteries like Panasonic lasts longer. I recommend downloading the official Mercedes-Benz app, which alerts you about the battery status to avoid surprises. Don’t forget to clean the key contacts to prevent dust buildup—just wipe them occasionally with a soft cloth. Doing it yourself saves hundreds compared to going to the dealership—how great is that?
