How to Replace the Key Battery for a Mercedes-Benz Car?
2 Answers
Steps to replace the key battery for a Mercedes-Benz car: 1. Select a new button battery that matches the specified model; 2. Push the switch at the tail of the key upwards to eject the mechanical key, then remove the mechanical key; 3. Use the extracted mechanical key to press against the notch, gently pry outward to open the key casing; 4. Remove the old battery, replace it with the new one, ensuring the positive and negative poles are correctly aligned. Mercedes-Benz models include the E-Class, S-Class, GLS, B-Class, etc. Among them, the E-Class has a body size of 5021mm in length, 1854mm in width, 1487mm in height, and a wheelbase of 3014mm.
As a Mercedes-Benz owner, my experience changing the key fob battery was straightforward. My key has two or three buttons – just use a coin or small flathead screwdriver to gently pry open the casing by inserting it into the side seam. Remove the old round coin-shaped CR2025 battery (double-check this size when buying replacements). When installing the new battery, ensure correct polarity (usually ‘+’ side faces up). Carefully snap the casing back together until you hear a click. Test remote locking/unlocking functions afterward. Mercedes key batteries typically last 1-2 years – replace proactively when dashboard warnings appear to avoid being stranded. DIY replacement saves dealership trips and costs under $2 for quality batteries. Keep contacts clean and avoid moisture (I once had key failure due to leakage corrosion). The whole process takes about a minute – apply minimal force to avoid damaging plastic components. Regular maintenance extends key life, and Mercedes designs these for user-friendly servicing.
