Can someone please tell me where is the battery on a 2009 ml350 please.

Thanks

 

It's located under the engine in the space between cylinders 3 and 4. Unlike typical lead acid automotive batteries, it is made with lithium and so fits into a particularly small space. It is underneath the engine to protect it from radiation that emanates from the engine control computer.

Either that or it is under the passenger seat.

 

I bet its under the right hand front seat....

 

And, first-time access requires cutting the carpet.

And, if you're thinking of jump starting, this isn't the place to connect. Connections under the hood for that.

 

Plus 1 on all the above.