I would consider a voltage cutoff mandatory with LiPos as they can go up in flames! Most ESCs support this now at all price levels. Also, I consider a balancing charger mandatory as well. Your batteries will last longer with fewer issues. They don't cost that much more either. Consider it cheap insurance as your house/car are at stake and anywhere else you are charging your batteries. Use a LiPo bag too. Most tracks require them.

I see this is an old thread... I hope you followed this advice before now!