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11.17.2009, 12:32 AM
You only need the external BEC to power the radio and servo. The SW BEC circuit is still powering the internals of the SW. If the chip shuts down then the SW gets no power. So basically if the SW arms then it should work, if not then it's one of the chips that are within spec and are shutting down due to over-voltage. Not to mention 4s will void the warranty (right?).
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