Topic: Aerobirds and Lipos

Running an 11.1 V Lipo on the stock electronics will most likely blow out the voltage regulator. I've done this and the same thing happened.
The voltage regulator on the PCB is regulated at 4.4 volts, not a standard 3.3 or 5 volts like you might expect.

I've never had a problem running any NiMh (range 7.2 to 10.8) in any of the Aerobirds or the 7.4 V LiPo. For some reason, the 11.1V Lipo
would mess up the board. The Lipos don't droop the voltage as much under load, as compared to the NiMh so I believe that may have something to do with it.

On the other hand, the Parkzone Warbirds do not have a problem with 11.1V lipos, but I have not measured the voltage regulator on that one. It is possible that it is different
but I doubt it. It is also possible that the MCU to FET connection is not configured the same. Meaning, the pull up resistor is tied to the regulated voltage, not the battery voltage.

To answer your question on your Swift, I believe the output of the MCU is tied to the FET and has a pull up resistor tied to the battery, not the regulated voltage. The increased
voltage from the 11.1v Lipo probably blew out the MCUs port pin driver - leaving it floating. This means the signal to the motor is always on.

JC