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These are the lipo's we would highly recommend you fly with when using your BetaFPV 65x - We advise not to use the 2x1s configuration.
After numerous tests we found the 1s lipos simply couldn't handle the power draw that these 2s brushless tiny whoops require. Yes you will be able to fly with them but not for long and your batteries will always come down too hot. You risk damaging the 1s lipo's with the 2s whoops.This Lipo can also be used with the BetaFPV 75x - one battery for both brushless whoops!