Tutorial on Replacing the Battery for an Older Model Mercedes-Benz R320L Key
2 Answers
Here is the introduction to replacing the battery for an older model Mercedes-Benz R320L key: 1. Before replacement, it is best to first understand the battery model of the car key and then select a new key battery according to the specified model. 2. From the tail of the key, push up the marked switch, and the hidden mechanical key will pop out slightly, then you can take out the mechanical key. 3. Still at the tail of the key, use the just taken out mechanical key to press against the marked position, apply a little force, and the key shell can be opened. 4. After opening the key shell, you can see the battery position is relatively deep. Insert something along the gaps on both sides, gently pry it, and the old battery can be taken out. 5. After replacing with a new battery, make sure the positive and negative poles are not reversed. Then proceed with the installation steps: first insert the top of the shell, then press the other end firmly to complete the battery replacement. Finally, don’t forget to put the mechanical key back in place.
I'm the type who enjoys tinkering with car keys. Last time when replacing the battery for my old Mercedes-Benz R320L, it felt simple but required attention to detail. There's a seam on the side of the key fob—use a small screwdriver or thin coin to gently pry it open, but never force it to avoid cracking the plastic shell. Inside, you'll find a CR2032 coin cell in the battery slot. Remember the polarity—the side marked with a plus sign (positive) should face upward. Remove the old battery, wipe the slot with a tissue to clean off dust, then insert the new battery in the same orientation. Close the shell and press firmly until it clicks into place. Test the remote lock/unlock immediately after replacement. If it doesn't respond, the battery might be reversed or there's poor contact. I recommend using reliable brand batteries like the Panasonic CR2032 I used—it lasts over a year. Avoid placing the key in hot spots, like under the windshield in summer, to prevent rapid battery degradation. The whole process takes about five minutes, but keep a small tool pouch handy to prevent losing tiny parts.
