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In a 2010 Mercedes ML350, the auxiliary battery is positioned beneath the hood of the car. You should start by going inside the vehicle to release the hood lever. Once outside, lift the hood and release the safety latch. With the hood open, find the main battery first, then look to the left where a black box with red and black wires is situated. This is where you will find the auxiliary battery inside the black box.
That statement is incorrect. The battery is actually located beneath the seat on the passenger side.
In the 2010 Mercedes ML350, you can find the battery under the hood. Just search for the sizeable black box with a red and black connector on the top.
In my ML350, the primary and secondary batteries are positioned beneath the passenger seat. To reach the secondary battery, you must first remove the main one, which can be cumbersome due to the confined space. An alternative approach is to disconnect the three connectors and remove the seat for better access, which is a more straightforward method. For detailed instructions, you can refer to the following video guide: https://www.youtube.com/watch?v=PCp3lztb1cM
In my 2010 ML, you can find both the auxiliary battery and the main battery located beneath the passenger seat. To get to the auxiliary battery, you'll have to take out the main battery first, which can be quite a hassle when following the instructions. The simplest approach is to remove the seat to change either battery.
James M. is accurate about the location of the auxiliary battery. The primary vehicle battery can be found underneath the front seat on the passenger side. To remove it, simply slide the seat all the way forward and take it out from the back seat.