I dug into the pit from the inside but there is only a blower. I have a problem with the battery displayed and the service visit message, Charging at 14.1V, the battery is not new but it burns to the touch.
✨ The discussion centers around the existence and location of an additional backup battery in the 2005 Mercedes W203 C180. Users clarify that this model does not have a secondary battery; it only features the main battery located on the passenger side, under the cabin air filter housing. One user initially inquired about the backup battery but later identified the issue as a failing alternator, which was not charging adequately, leading to battery problems. The alternator was found to be charging at 13.3V instead of the expected 14V.
