Drone keeps dropping down then lifts up

Huh? Why would you do that? What charger do you have.

I just stopped it because I had to go out. We can’t leave it unattended.
HTRC C240

Nice charger. You seem to be Mis-managing your batteries. I asked what mah were charged, that charger will tell you that.

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Ah, my bad. I don’t remember exactly how much mAh.

I fear this adventure will end in tears. LiPo batteries must be charged properly. Please read the instructions and information you’ve been given so you don’t destroy your drone, or worse your house. It is likely you have already destroyed your battery if you’ve taken it repeatedly to a resting voltage of 10V.

I haven’t used this battery for that much time since I recently got it. I did follow the instruction on how to properly charge it.