Well, I called Horizon Hobby today and they told me it was probably the 4in1 and said they would replace/fix the problem. The only problem on my part is that I have to send the whole heli back to them so they can make sure it is that. They would not send out a replacement. I forgot to mention before that I have three batteries for the heli and the same problem happens with each one. Maybe the charger is bad. I hope the turn around on repairs is fast. Thanks.....