Chris,
Check if the balance conectors wires are Ok.
I bougth 4 Batteries TP5000 10S which I charge with Orbit Charger and decided to Balance them every 10 flights (also Orbit balancer)
Well when I was doing the Balanced charge, I saw a very extrange behavior of the balancer lights so well I decided to check each cells
separately and I found a loose wire, I opened the package and found all the weldings to be "cold welded" and the white wire loose,
know let me tell you that this happen in two yes 2 out of 4 Batteries