My battery in my ML350 2013 won't keep a charge. It starts slowly but does start. It won't go into gear though until I either let it run for 15 minutes or if after about 2 min I shut it off, open my door then start it again while shutting door and push button for it to go into gear. My battery tested cold at 10.64

 

You are on the wrong forum.

https://mbworld.org/forums/m-class-w166-149/