Just a note to those like me who are fairly new. I bought a pixhawk which came with the APM power supply (powerday). I connected a 3s lipo and burned the pixhawk out. I checked the voltage from the APM and it was letting the full 14 volts through. A simple check before hand would have saved me a lot of time and trouble plus costs. The output should be 5 volts I think.
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