I am flying with that heli for a few weeks now and then I decided to buy another LIPO battery to be able to fly twice as long. Unfortunately a bad design of the heli caused the loss of one of the battery because the casing of the electric motor is spinning which I did not realize and the batter is placed right next to the motor without any restrictions. So one day I mounted the battery too close to the motor and the spinning motor cut into the battery causing parts of the battery to fail. I was told that I am lucky that the battery did not caught fire but I really thing that this is a bad design of the manufacture. Either they put into a piece that separates the motor and the batter, mount the battery somewhere else or but a warning label where the battery is mounted.
This is the cut into the battery:
This is the heli with the battery mounted:
I have another heli from a German manufacture called Robbe and they mounted the battery underneath the body and the motor is completely enclosed. But as the old saying goes you get what you paid for.
Have fun - Andy