So you roll up on a MVA that involves a GMC Acadia and your officer assigns securing the 12 volt power-source. Is your gut reaction to go straight to hood? With this vehicle is better not be. Also forget looking in the rear storage area too. The battery is located in the floor pan behind the front passenger seat. There is one small screw to deal with on the battery cover underneath the 2nd row cross car floor mat, a T20 Trox screwdriver/bit. Since you are securing the power you should just be able to pry the plastic cover up. You can enlarge the image below to see it battery.
Also keep in mind that the GMC Acadia, Chevrolet Traverse, Buick Enclave and Saturn Outlook share the GM Lambda platform. The Saturn Outlook is not made anymore, but those vehicles can still be on the road.
The two images below are from the Crash Recovery System made by Moditech Rescue Solutions. The Crash Recovery System is a computer program that provides real-time on scene vehicle information. This program can save you time during your extrication by knowing the locations of Ultra-High Strength Steels, Airbag and lift assist cylinders and much more. For more information, visit their website: http://www.moditech.com