[Bondonutz]

If you have a volt meter check individual cell voltage first, I've had many balance tabs go bad. My only real complaint w/HC packs, shizzy balance tabs and wires.

If the one cell is def showing no signs of life carefully remove the shrink wrap and tape and inspect the board, sometimes with excessive heat the little "circut breaker" of solder may melt and cause this problem.

Worst case scenaro you can remove the dead cell reconfigure the balance and + & -main wires and install a 5s balance tab.