I use this for power. I use this OTG cable that splits between tablet/power/AmazonBasics hub.

Then the JoyCon EXC, EasyCap, UCA202, and a USB extension for plug-and-play for USB/HDDs go into the USB hub. The charger is wired to the ACC, so key on = power = tablet and dash cam (plugged into that second USB slot) power on.

I have the tablet set to 5 seconds to shut down for the "starting" issue. Before I used 1-3 seconds and it wasn't enough. 10 seconds was too long. Found that 5 seconds was perfect and gives a nice view of the shutdown picture.

I already have this one, do you think this would work since it is 4.8a?

http://www.amazon.com/gp/product/B00ISGCAJM?psc=1&redirect=true&ref_=oh_aui_detailpage_o04_s00