Gens Ace Lipo Concern

I just bought an aquacraft ul-1 superior. It's my first rc boat, I've had rc cars and trucks but have been out of the hobby for a little while. Anyway this is my first time dealing with lipos and brushless motors. I have been looking through this forum a lot and came to the conclusion that Gens Ace are the best bang for the buck lipo battery out there. I went to a pond the other day for its initial run and the solder joint on the prop shaft broke so I lost the bottom part of the shaft as well as the prop. I called up the hobby shop I bought it from and they told me to bring it in. Brought it in and they guy that was helping me out was putting a new shaft with prop on(free of charge since it happened about thirty seconds into its first run), and we started talking about the boat and lipo batteries. I asked him if he had ever used Gens Ace before and he said he hadn't but there was a fire on their indoor track which was started by a Gens Ace battery. I am new to lipo batteries and I am concerned after hearing this. Should I be concerned or is there anything in particular I should do to make sure I don't have a similar problem? Any comments would be greatly appreciated. Also in the brief time I was running the boat I felt that the boat was not steering enough. I realized after it broke that the D/R was on its stock setting. If I turn this up should it give the boat a considerably greater amount of steering?