Hello there! First post here, hope someone can give me a hand on this. been googling around for a couple days without finding much information about it. I saw a review of a power bank that can power the 2016/17 MBP and keep it from charging the internal battery while at it. It seems like an awesome thing since this would heavily increase the lifespan of the internal battery of MBP. I wonder, does anyone know how this works? Is it something that gets activated automatically when the input voltage is 12v? Or maybe it is activated once the voltage falls to 9v? On second hand, it is something the user can choose from somewhere in the OS while connected to an external power source? All information on this will be very much apreciated!!! Thank you!!