[Pinewood]

Originally Posted by pokerface

Certainly makes sense. However I'd imagine battery drain will be massive powering all of those cameras through the core system while in parking mode.

This is the biggest issue unless they mount a secondary battery (charged by the primary) , and used exclusively for the camera subsystem. Although possible, it would present a high overhead in terms of weight,cost and reliability.
You may have seen my musing about a dash cam and have bitten the bullet on the ddpai M6+ which has the ability to perform time lapse and park guard functions if a power source is left on .
The only power bank that can do this safely is the Cellink B battery pack.

http://www.car-dvr.co.uk/cellink_b/p...cellink_b.html