Power issues with MicroLipo

[ShadowChaser]

I'm running a microlipo in my setup, and I'm having the following problem.
When I power the Pi 0 from it's native onboard micro USB-B port, it powers on and works fine. When I try to boot from the lipo I have (1200mah 1s 3.7v from adafruit) which is verified to be charged, nothing happens. The green light on the Pi does not turn on. It just doesn't seem to work. When I plug a Micro USB-B plug into the micro lipo and it indicates a charge/is full, the Pi still doesn't power on. No green light, nothing. I checked continuity between all points from the Micro USB port on the microlipo to the VCC and GND pads on the button PCB. It all seems to check out. What's the problem here?

[Helder]

We can't give you any info unless you show us your wiring, which is likely your problem. You can test the voltage of the battery all the way to the Controller PCB to see where there is no voltage and figure out where it's wrong.

[ShadowChaser]

We can't give you any info unless you show us your wiring, which is likely your problem. You can test the voltage of the battery all the way to the Controller PCB to see where there is no voltage and figure out where it's wrong.

I'll get a pic in asap, but I can verify with a multimeter that at the pads on the PCB, the voltage reads 4.2volts. I think it might be a bad solder joint but I don't know where the bad joint would be since I don't see a VCC label. I'm assuming it's the 5v?

[ShadowChaser]

[Helder]

5V is the VCC pad that the battery get's wired to so check to be sure that the pi GPIOs for 5V have some kind of voltage there, Also GND needs to be checked as well since that is often harder to solder from the GPIO to the PCB. You could try the GPIO below the A button GPIO as that is another GND to solder to the PCB.