Gens Ace connectors came loose inside case
 

Hi, I have 2 Gens Ace 5000 4s 40c hard case batteries. A few weeks back the middle wire of the balance ports came loose in one of the batteries. I opened up the hard case (very carefully) and successfully managed to resolder the loose wire.

Now, the other battery has the same problem (wire from balance port came loose) and in addition, the thin foil that connects the 12AWG red (+ve) cable to the battery broke. I was surprised at how thin the foil is. Anyways, any hints on how I can reconnect the 12AWG cable back to the cell? All cells are in perfect condition so it would be a waste to throw away this battery.

Thanks!