[record10carvon]

The battery in it just got put in there a few hours ago lol, it's a Mercedes brand official OEM battery and everything

Accessory battery....if I am not mistaken under the dash above your left knee.

 

[record10carvon]

W203 doesn't have an accessory battery

Unless I am insane...my 2005 C240 wagon does and I have replaced it....maybe I am confused with one or the other cars.