This is a view of the rear battery racks:

Here we see the front battery racks:
That battery is simply a group-31 sized test box used to validate the fit: 2lbs instead of 70lbs! There will be two batteries at the top, and four across the bottom. This front compartment will also be home to one charger, the DC/DC converter, 12V accessory battery, and the heater relays. The spare tire will have to be relocated.