I know what you mean.. Mine took so darn long to accept a charge when I first got it that I thought the controller was broken (wold only blink one light for over an hour)... Leave it plugged up for a long time.. It will eventually charge up..
Funny, had a similar experience. Tried to power on the transmitter and would not. Plugged in the charger and only had one light. Took about 3 1/2 hours for the full charge. After almost 30 years of RC heli's. was not used to that long of a time to charge.