Are you sure your battery isn't just dead? That's happened to a few people. Try just letting it charge for a bit.

I let it sit until a full charge, led on the usb port is now green. Still no go:
I have a black wire coming out of the switch instead of red, just because I had that one soldered on before I knew we were going to use the BAT instead of GND for inline, wiring from the usb port. Its still coming from BAT, even though its a black wire.
But check your wiring anyway here: viewtopic.php?f=34&t=3297
I keep rechecking and everything looks fine...here's another closeup of my helder board:

Once again, I have a black wire instead of red going into the VCC pad, from the power switch. Also I have a purple wire instead of green for the USB setup now, because my white wire was solid core, wasn't bending well and snapped off the sound board.
I measured voltage on the VCC and GND pads on the Helder board, its 4.1 when my power switch is turned on (with or without the usb plugged in, so I know my battery is keeping charge), and 0.4 to 0.6 when its switched off. And everything still works just fine when I'm plugged straight into the pi. I'm guessing I'm just missing something really stupid but I can't figure out what...