GLK 350 Battery Located
If you have no idea what to do, call the MB roadside assistant...but they charge about double for what you would pay DIY.
It might be a good idea to take a look at your owners manual...all kinds of information there.
The battery is an AGM type battery. A large battery store like Interstate will have it but not a Costco or WalMart type store. They are a bit expensive ($150 to $225) but it needs to be the exact fit. A regular "flooded cell" filled with acid won't work.
To hold the charge of your electronics a small charge maintainer can be used but I don't think pulling and replacing leads to a restore Armageddon as suggested. The battery store might have one if you ask - or even change the battery for you. I know Interstate offers this.
There are two jump points on the fender wall near the battery for a jump. The positive terminal is reached by sliding over the red cap and the negative is a tall brass colored stud nearby.




