[Q] Power connectors?

Ok. So I was given a Nexus 10 that wouldn't turn on. After replacing the micro USB cable and testing it, I still haven't found the problem. I have found that when I power it from the right connectors on the dock port, it powers it. However I wanted to go further(actually, I broke my dock connector and waiting for new one in the mail and it has caused me to want to experiment more [emoji14]). I want to directly power the tablet from the battery connecters. My question is, which if the 4 cords leading up to the battery would actually charge the battery? I've tried many combinations and I've only gotten it one time but I don't rememebr the connectors I was touching and I haven't gotten it since. It doesn't seem that I've shorted anything out, so it should be fine. So I'm asking here. Which of the 4 cords of the battery that lead into the motherboard would power and charge it?

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