ORIGINAL: ozief16
The 140RX is setup for a LifE 9.9v batt. I don't think the old two cell LiPo will work correctly (I may well be wrong here, I just know what the 140 is setup for from the factory).
Again, not sure if I'm helping or introducing confusion, my apologies if it's the later
Dave
Worth checking the voltage the ECU is set up for.
Mike