The OBDII is a standardised adaptor, and you can connect external power via cables for troubleshooting. The DC power (positive) pin is Pin 16, and pins 4 and 5 are grounds (negative)
Top Row (left to right) Pins: 9-16
Bottom Row (L to R) Pins: 1-8
By using an external power source like a table top supply as shown below, you can troubleshoot power problems such as batteries yourself. The Bolt can be powered on 5V to 36V Max.