Registered 2005 SLK55 AMG
I did this a few months ago but in the light of recent discussion I thought I would add. I wanted to be able to switch off the battery with the minimum of effort so the plan was to introduce the switch so it is accessible without even removing the battery cover.... wowee! These battery switches are easily available for auto of marine installations, the only problem was that the reasonably heavy duty ones had a little too much depth to clear the gap between the battery and its bulkhead panel. The posts inside the case are really much longer than needed so I removed enough of the post to give me the depth I needed. I then sawed the plastic casing still allowing a reasonable gap between the posts and the back-plate of the switch assembly itself. Next I attached a short length of negative cable from the battery to the switch and used the original cable to connect to the body. I did not want to drill holes in the battery compartment so I used heavy duty Velcro to securely attach the switch to the inside of the battery compartment. Presto! In the pictures you will also see my Ctek quick connectorplugs which I adapted to use with my Ring smart charger.