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gie62001 exactly same issue. Flew on second lipo and just before landing flight controller started making beeping sound and it just dropped to the ground. i thought the lipo was empty but lipo was at 11.3V so still plenty of voltage. changed the lipo and the quad would make beeping sound but not arm. got home plugged in my anti smoke bulb to see if there was resistance somewhere on the controller and the light came on which shouldn't be if all was ok.

Waza 20/12/2017
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