Well, I am running a lot of planes with A123 batteries without regulators.

But, I have a scale FW-190, and prior to a test flight, I smoked 4 hitec servos inside the fuselage (using ar7000 receiver). One on throttle, the other two on elevator and rudder. I also smoked the retract HS-81 servo.

Everything worked fine on the bench before going to the field. I have since put a regulator in that plane. I already had one on a separate A123 ignition battery.

Not sure what happened, but I smoked them good.

billrad