Well, the manual recommends charging Li-Po's at no more than the 1/2C rate which is correct for this charger. It also states that a capacity charge should be applied. If you follow those two rules it would be next to impossible to create a hazardous situation with an undamaged battery. If you fly the battery until it's obviously nearly drained, a capacity charge is easy to do at the 1/2C rate. You can also discharge the pack first if there's any doubt as to how much you should put back in. As I said before, I can only go by what I have experienced with the 969 and it has worked and continues to work for me.