How to Replace the Battery in a Mercedes-Benz E220 Key?
2 Answers
Mercedes-Benz E220 key battery replacement steps are: 1. Remove the mechanical key from the smart key; 2. Use the mechanical key to press the shallow slot on the smart key, and the back cover will pop out automatically; 3. Take out the old battery and install the new one; 4. Reattach the back cover and the mechanical key. Taking the 2021 Mercedes-Benz E-Class as an example, its body dimensions are: length 5078mm, width 1860mm, height 1484mm, wheelbase 3079mm, fuel tank capacity 66l, equipped with a 1.5t turbocharged engine, maximum power 135kw, maximum torque 280nm.
I usually enjoy fixing cars myself, and changing the battery for a Mercedes-Benz E220 key is no stranger to me. The key casing usually has small gaps, and you can gently pry it open with a thin screwdriver or a case opening tool. The battery is typically a CR2032 coin cell, which can be bought for a few dollars at supermarkets or online. Be careful not to use too much force when prying it open to avoid damaging internal components. After removing the old battery, place the new one with the positive side facing up and press the casing tightly. After installation, it's best to immediately test the key's unlocking function to see if it works. If the casing is hard to pry open, there might be glue inside, so just be patient and you'll get it done. Doing it yourself can save you tens of dollars in repair fees, and the tools are simple, making it suitable for beginners. But remember: don't let metal tools touch the circuit, as it might cause a short circuit. Regularly check the battery life, and changing it once a year can prevent trouble.
