(2) Garmin Mini2 and blackview battery install questions

[FrankMstein]

I am only dangerous with a multi meter. I have searched YT to become certified in this subject but there isn't any help there. I have a Garmin Mini2 already hard wired and not in a correct fuse. It does not stay on like it should beyond the short time until it goes to sleep. I have the hardwire box jumpered to 12v? internally. I would like the unit to stay on until the battery drains for a while to that voltage. I have also come across a second Mini2 and another hardwire kit that I want to install for the rear.

I am looking at a Blackview B-112 which should be plenty of battery for 2 cameras or the BlackboxMyCar PowerCell 8 which is too much money, weight, and size. Question is that I need to know how to connect all of this up so my cameras are not running for 24 hours. I only need to have 2-3 hours of camera time for both.

Can someone tell me how and to which fuse to use to connect the battery to and if I can connect both cameras to the one hard wire power port in the battery for parking mode? I do not want to use any cigarette ports or USBs. Also I do not want my car battery to charge the Blackview when the car is at rest. My drive 45-50min/day and some times the car sits in the garage for 3-4 days. I am considering a Blackboxmycar battery.

What other options are about there? I'm not getting another separate "custom" battery setup.

Please help

[NealfromNZ]

Fuse area 124-129 would be suitable. These are switch on when the cabin is occupied and automatically switch off when car is locked or after 10- 20 mins.

With that fuse area there are always spare positions available as these are used for infotainment system such as handler cable , amp fan , usb hub , tv module. You can either get a fuse piggy back for easy install or pop in a leaf contact connector into the underside of the fuse box.

Sing out if you need the part number for the leaf contact or look at the last page of my amp and speaker install for roughly how to insert a new contact into rear fuse box.

[FrankMstein]

I had the acc and batt wires backwards and it now stays on for an extended period of time for parking mode using 161 die battery (always on) and 159 acc (switched). I will now splice in this new unit into the current locations with the same fuses. When I get a battery I will convert it to operate on the same fuses??? FYI my car goes to sleep in 12 min.