I have the A810 with battery pack/LTE module and have parking mode on, with a medium collision detection and I only ever get between 12 and 15 hours of battery life although according to 70Mai I should be getting on average around 20 hours. It got even worse this winter because of the extreme cold we experienced in New York- sometimes it would take close to a half hour before it would warm up enough to work and then I would only get a few hours out of it.
Anyway the 4K Omni supposedly can record for 26 hours on the battery. For the price difference between the two cameras in my opinion I'd stick with the Omni and go with a larger battery pack from another company.