mambasoft/2.6.38.3-hannspad — comment on commit a11cd3a0554c8685ea7c875c1b2ea684a2e9df42
File:  line 0
By imayoda:

Unfortunately usb charging is not supported due to the 7,4V battery and only 5V usb (and no elevation circuits on it for sure.. no coils no caps nothing... only 12V to ~8V circuits)
brainstorming yes!!! i like it!!!

this is what i think about pin1 starting from left: pin1 is normally polarized +5V from pin3 on that tiny mosfet.. there's a bigger smd capacitor between pin and ground that confirms it outputs some power (C337)
once tegra usb enters OTG mode mosfet should be powered off and remaining power is would be depleted on the near ground (there's a tiny resistor to ground.. the one on the right on the array of 4 under the transistor)... now the OTG condition is sufficient for working operation but on pin 5 there's still ground.. so only datalines are really in OTG mode

i don't have such small multimeter needles to be sure about the true nature of those 4 smd components