I have converted a LifePo pack to use it in Turnigy 9x.The stock plug from AA battery tray is attached to the battery now.how to charge it using my Turnigy charger?? If i attach only the balance plug its showing error as not properly connected.please check the attached image and suggest me the solution.

Which charger are you using? I'm assuming it as a accucell & it doesn't charge via balance port only. Get a male relimate connector/socket of the same pitch and solder deans at the other end. Now it can be used with a conventional charger. This is a DIY.