Upgrade Sony Alpha NP-FW50 Battery Pack (A teardown and rebuild of the external NP-F550)

My previous external camera battery pack, a double pouch cell lithium battery scraped out of a tablet with a custom cage, just expired. It had been taking less and less of a charge and was starting to dip toward 6v under load. So I pulled out my lithium battery packs and found a double cell that&still working! Naturally, once I had soldered up a couple of leads to attach a barrel jack necessary for the NP-FW50 dummy adapter it mysteriously stopped working. In this video I&be taking apart the NP-F550 battery pack that I&be using as a replacement to see if I can diagnose what went wrong or at least clean up all the connections and get it back to a working state. If I can it&be the new external battery pack attached to my tripod for shooting video with my semi-portable recording rig.