Pogo pins power clarification - reading schematics

[bokomaru]

The wiki seems unclear to me. Wiki - Pogo Pins [edit: link to an old version of the wiki page before changes that were made as a result of this thread. See also the old diagram image ]

There's an image describing the pinout, and there's a breakout board design which seems to match.

Code:

INT  SDA  SCL
VBUS VBAT GND

Below that, the wiki says

The VBUS pin is powered by USB and is 5V at up to 500mA. The second power pin is VBAT, which connects to the battery voltage.

I wonder what "connects to battery voltage" means...

Looking at schematics and datasheets...

I don't see the pogo pins labeled on the physical mainboard. If I put together the component placement drawing (or the pinout on the wiki) with the schematics, I suppose the pinout goes like this.

Code:

PIN6 PIN2 PIN4
PIN5 PIN1 PIN3

or

Code:

INT    SDA  SCL
USB-5V DCIN GND

Now...

DCIN: DCIN from J1300 (40PIN) on the mainboard connects to VBUS on J101 (40PIN) on the USB-C small board, which goes to VBUS on J101 (USB_TYPE_C_RECEPTACLE). So DCIN would be the 5V input from a USB-C charger. It goes to ACIN1/ACIN2/VBUS on U600 (AXP803 PMIC). If ACIN/ACIN2/VBUS is available, the AXP803 uses that as the power source and charges the battery. DCIN also goes to pogo PIN1.

USB-5V: PS (IPSOUT? Power Supply?) comes from U600 (AXP803 PMIC) and feeds L606 (LP6226CB6F boost converter), to make USB-5V. USB-5V arrives at pogo PIN5.

DCIN and USB-5V loop: Don't know exactly how this works, but if DRVVBUS is enbled, USB-5V actually provides DCIN through U1302 (LPW5206H USB power loading switch). So we can provide a 5V output for a USB device on the USB-C small board J101 (USB_TYPE_C_RECEPTACLE).

VBAT: In schematics, VBAT comes from J600 (the battery connector). Pretty sure it never touches pogo PIN1/DCIN nor pogo PIN5/USB-5V. The wiki calls pogo PIN1 "VBAT".

Questions:

1. Is that a good read? Did I get it wrong?
   
2. Did I get the pinout right? Why are PIN1 and PIN2 in the middle?
   
3. Does USB-5V/PIN5/VBUS provide a 5V output up to 500 mA?
   
4. Is DCIN/PIN1/VBAT a 5V input for powering the device and charging the battery?
   
5. What happens if you connect a 5V input to DCIN/PIN1/VBAT and to the USB-C connector at the same time? Would that short together two power sources?
   
6. "VBAT, which connects to the battery voltage" would make me think that pogo PIN1 basically connects to the positive battery terminal VBAT. Not true though, right?
   

Reason for asking: Obviously I'd like to use the pogo pins. But we should also clarify the wiki.