For LK-7900 Power Magic Pro or LK-350, and do I need LK-530-12V Dash Cam Smart Power Supply Battery

[SoCalCJ]

For LK-7900 Power Magic Pro or LK-350, I have a decent battery, like a upgrade from the Optima, it is Gel and 1000 cranking amps, should I get the LK-530-12V Dash Cam Smart Power Supply Battery as well??peace of mind and all, if I leave car at airport for 3 days?? what then?? (this only once a year, my travel has slowed down)

 

[SoCalCJ]

http://lukashd.com/dashcam/product_info/power_lock_3.html

Ok I found a manual, their site had 2 different milliamps like it was 2 different products, it is selectable...so it lasts 11 hours max, if I am on a 3 day trip, can I set up the power safety device like a LK-350 so the LK-530 s still getting a charge from my battery when car is off it gets a charge until the 350 detects the drain n the battery, then it shuts off instead of shutting off the power to the unit I shuts off the charge and then the 530 kicks in and extends it by 11 hours....will it work? , RSVP please help the newbie I will help any time I can...