#Power magic battery pro
I then wired the neo 9 output to the power magic pro instead of wiring direct to the blackvue dash camera remember this output only sends power to the dash camera only 1 amp max. To begin I connected the neo 9 the way as advised in the instructions to the cars fuse box, for charging the neo 9 through the input and to monitor the battery health if needed and you can do that through the cars constant power.
I installed the Cellink neo 9 and did not want draining the backup battery when parked up in the garage or at home or when simply not needed I mean no sense in draining the backup battery down unnecessarily. I know this is an old thread and no longer monitored in case anyone Googles this topic I did just that. When the car is running both batteries are charged with a large isolating diode between the two positive battery terminals to allow both to charge but not for the main battery to "charge" the second battery - you wouldn't even need a PMP as the camera would be connected to the second battery and you could run that battery flat until it didn't have enough power left to run the camera.
Maybe look for another alternative - Police cars and many 4x4 vehicles that go off road for camping etc have two car batteries - most electronics/radio/fridge etc run off the second battery so the main battery always has enough charge to start the car etc, even if the second battery is dead.
3 Amps then it will take 21 times longer than the charger for the Cellink. That's not quite correct - As Ralph2 says you need a differential for electricity to flow - and that differential is Voltage not current - in other words if the voltage on the charger is higher than what it's trying to charge then is will charge - how quickly it charges is a function of how much current flows - so if the Cellink needs 7 amps to charge, if you only supplied 1 amp it would still charge but take 7 times as long.
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