Amen. A $25 toy drone is a wonderful flight trainer for developing the basic muscle memory on the controls. It's also good for rainy day indoor flying.
Honestly your main concern would be them popping out during flight or worse yet NOT popping out, and either getting stuck in the Drone or cracking the body. If you fly it recreationally, I would be careful around people. I have an Air 2S that...
If that is the case, why would you ever tell the insurance company that it was slightly swollen before flight? It would otherwise be impossible for them to prove!
Don't deny your own claim. LOL!
It was the charger and not the battery that "failed."
It was also not a DJI charger, nor a DJI battery.
Dude has literally hundreds of LiPo batteries over many years and had a single charger fail only once.
It can happen, but it is clearly more...