Hello,
I was linked to this thread from a thread I had started on the same problem. Here is my find...
I purchased Reiboot based on a suggestion on this thread. reiboot's pro version didn't help. Reading on the internet, a few days back, I came across information that faulty chargers or lightning cable could ruin the charging system, which in turn would mean that even while the battery inside the iPhone is working fine, it won't charge.
I investigated my original apple lightning cables and also took a look inside the lighting port on the iPhone (6s plus, in my case) to see if there are any signs of burnout. What I found is that one of the cables (I have about 3/4 genuine ones and I dont use non-genuine ones), which I had connected to a transcend powered usb 3.0 hub had a black mark (almost like a small dot) exactly on one of the 8 connector 'pins'. Now, even the lightning port on the iPhone, had a similar blackish, burnt like, mark on the connector pin corresponding to the the pin on the cable, when looked at towards the side of the home button (upwards), where the port has the pins that connect to the pins on the lightning cable's socket.
I think this is either a case of a faulty chip inside the 6s plus which maybe causing over current or over voltage, or maybe some bad code in iOS11 which controls these chips, or could be a problem with either the lightning cable or the transcend hub.
I am going to post pictures in a day or two once I run a check on all the cables and the connector pin on my apple lightning dock.
Here is a link to my thread...
Updated to iOS 11.0.0, 2 days later iPhone (6s Plus) stuck on boot logo and wont recover either.