Everything works except the battery not connecting

Hi, I have a G4 iBook, 1GHz
The AC works, and will power the iBook, but without it, nada.
Two batteries tested, that worked before I opened the thing up and successfully repaired a video issue, and the DC is non-existent.

I opened it up again and double-checked every wire and everything else I could see. I could not find any info on this, the battery connector I guess, anywhere. Not on ifixit.com either. Something just went haywire, and I beg of you all to try and help me figure it out.
THANK YOU!

The battery indicator in the menubar even detects it. It tells me it's at 98%, and as soon as I take it out, it notices. Fully functional it seems, and I've restarted several times, but if I unpluc the AC, it's off. The iBook knows it has a battery, it just won't take the juice!

I reset the PMU, too. Nothing. This is so weird!