Two.Two.
It was built with two batteries, yes.
It doesn't...
No, just one and it is in the trunk.
Most diesels have 2 batteries to supply the necessary cold cranking amps Two little batteries are cheaper then one big battery
The question assumes there are 2 batteries, when in reality there are not 2 batteries. It has only one and it is located in the trunk near the spare tire.
One engine air filter and one cabin air filter.
There are two special tools that look like keys that are inserted to release locking tabs
There are two special tools that look like keys that are inserted to release locking tabs.
There are two, one is in the steering column, the other one is under the driver seat.
Chrysler V6, six to eight hours. Mercedes/Dodge Sprinter, two to three hours.
Get new batteries first, your local parts store will help with that, they might even install them for free! If not just open the hood use a 1/2 inch wrench to loosen the battery cables ( Two cables on both batteries) Remove the cables undo the hold down plate and trade batteries, tighten the hold down plate and the cables, make sure the red cables are on the + side and the black ones are on the - side.