key battery

A smart key is an electronic access and authorization system that is available either as standard equipment, or as an option in several car designs. It was first developed by Siemens in 1995 and introduced by Mercedes-Benz under the name "Keyless-Go" in 1998 on the W220 S-Class, after the design patent was filed by Daimler-Benz on May 17, 1997.

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  1. M

    Low battery

    Hi all Got the dreaded low battery yesterday. Not anything to do with the car but the key fob. Has anyone changed the battery in the actual key itself if so what battery was it and did you do it yourself. TIA Mick
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