yea, it's not worth losing a plane over a weak battery. If you plan on a long day at the field, you should always bring spare batteries. It's worth the extra little money. However, my plane seemed to lose control exactly when the full scale was passing overhead, which makes me believe it had something to do with my crash. I'm sure it's very uncommon for an airplanes radio equipment to interfere with an rc frequency, but it's still possible. Again, i'm not ruling out the possibility of a weak battery as the cause, but I may never know the reason. i will be more cautious with my next airplane. I think a range test is a must before every or every other flight. i tend to get lazy with things like but it's worth saving the airplane.