In the manual it does say you need a booster for 1s (3.7v ) operation:
1S LiPo Usage: the Comet can operate with lower input voltage then 7.4V but be aware that you need to run a receiver battery or „RX-booster“ when you‘re using a 1S LiPo or 4cell NiMH battery pack as it doesn‘t have a built-in booster.
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