I have the 4k package with the case and 2 batteries. I have been doing the 10 for 10 routine and have about 7 flights on each battery. Today I put a battery on the charger and it went into balance mode blinking red then green then red etc. It stayed on balance mode for about 45 min and I unplugged it and plugged it back in where the red light went solid red. The battery did not charge up any at all. Trying to charge the other battery it did the same thing. unplugging and plugging it back in has no effect at all. How long is the battery supposed to stay in balance mode? Am I looking at a bad charger? Thanks for any sugestions.