anyone familiar with this dual battery configuration with the auto on off marine switch this guy has? id love to see a write up on this

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go to 10:00 mark.

he has a dual battery setup that turns on and off if its charging and he can jump his own battery if his starter battery dies
 
He doesnt go into detail on the relay but I'm guessing it's the Blue Sea automatic charging relay, which I have on my truck and has been absolutely trouble free and completely dependable for years.
It's the unit with the yellow lever on top. It comes with a dash switch also, for manual control.
DSC_0598.JPG
 
There is a better way for jump starting using the second battery than his method and the blue sea charging relay allows for this. I'll explain if you have interest.
 

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