How To Change Battery In Car Key Mercedes. Follow the steps below to learn how to change the Smart Keys battery. Hold for additional 1 second.

Push the sliding tab while pulling out the key. Mercedes e class key fob battery replacement. Then simply replace the battery with a new cr 2025.
First hold your key by its keychain.
Replace the existing CR 2025 batteries with two new ones. Move the valet key to the opposite side of where it can be fully inserted then push down. If my memory serves me correctly after removing the metal key from the fob you can use it to release the button inside the channel then you can pull out the top fob with the pcb w battery attached. First you need to identify which key you have.
