How to Replace the Battery in a Mercedes-Benz R320L-CDI Key?
3 Answers
Press the gray button inside the remote key, and with the other hand, push the rear end of the key upwards. When a gap appears, remove the mechanical key. Then, use your hand to take out the rear end, and you can start replacing the battery. After installing the new battery, reinsert the key holder, and the key battery replacement is complete.
When the battery in my Mercedes R320L-CDI key runs out, I first get the right tools, like a small screwdriver or plastic pry bar. Locate the small notch on the back of the key, gently pry open the casing, and be careful not to scratch the surface. Next, you'll see a button battery, usually a CR2032 model. Note the direction with the positive side facing up, and use tweezers to remove the old battery. After inserting the new battery, make sure it's securely seated in the slot, then snap the casing back into place. Test the key buttons—if the light comes on, it means success. The whole process takes less than 10 minutes, and doing it yourself saves money and hassle. I recommend keeping spare batteries on hand, which you can buy at supermarkets or auto parts stores. Just be careful not to get the wrong model, or it might not work properly, which would be awkward.
Replacing the battery in a Mercedes key is all about preparation. First, you'll need a small tool like an eyeglass screwdriver. The key casing is usually held together by plastic clips, so a gentle pry will open it. Then, remove the small round battery—standard CR2032—and replace it with a new one of the same type from the supermarket, making sure the positive side faces up. After reassembly, test the functions. It's really not hard to DIY, saving you a trip to the shop and extra costs. I've also found that key batteries last about 2 years, and storing them in a dry place helps extend their lifespan.
