u/Zealousideal-Wave999

Hello! I've been wanting to repair my dad's old 80 GB zune for a while, and finally took initiative this past week, purchasing the Amazon battery, tools, ect, and following "Make.fix.upgrade" YouTube tutorial. Keep in mind, I have zero experience with electronics.

After assembling everything my zune won't turn on after several hours plugged in. I've tried swapping the blue and white wires and that didn't help either. I'm not sure if I did a bad job at soldering the wires (image attached) or whether I received a bad battery. Any help or suggestions would be appreciated!