The low voltage circuitry is associated with the batteries current voltage under load, capacity is not a factor.

It is possible the battery is at fault, cycling the battery and observing its capacity and more importantly its average voltage under load would provide the answer on its air worthiness.

Additionally I would cycle the battery several times prior to deciding on its abilty to function as designed and I would use the wall charger over night after a peak charge on the Triton to balance the cells.

Its always possible ther is a problem with the TX, if in doubt send it for service with the battery.