Ok, here my contribution.
After getting the message "Please Wait -Very Low Battery." I wanted to replace the battery of my iPod Video 5th 30GB, I broke the battery "brown connector" (it was already damaged, hence the message). It was completely ripped off of the PCB, the motherboard, including the solder paths! I could see some very small cupper dots. From these points I started with a multimeter with the Beeping (continuity test) function to trace the paths of the connections, since I couldn't find any diagram schematics on the internet. There are 5 pins, I labeled them for myself by numbers (1,2,3,4 and 5). By measuring I found that there are actually only 3 "main" pins, 1-2, 3 and 4-5. I soldered these points to the battery connector and hot glued it back to the PCB. And now it's working!
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