where is the battery

not sure on the v, the lift back has it in the right rear corner of the hatch, and it is under the rear seat in the c. they are all sealed, with a vent tube running any gases outside.
your o/m should show the location, as well as the location under the hood where you can jump start it.
edit: apologies, i see you have a lift back,so ignore my v comment, that was based on the forum i saw that you posted in.

 

As you look in the back, under the floor in a panel to the right side.

 

Normally does not need water

 

AGM type. No watering to worry about, although there were strange instructions on charging rates and length when I read about it....