First of all, take out the universal charger and mobile phone battery, do not power the universal charger.
Hold the phone battery in the left hand, do not need to distinguish anyway, pick up the universal charger in the right hand.
Contact the two poles of the most ends of the copper sheet of the mobile phone battery and the two poles of the universal charger, because the model of the mobile phone battery is different, the distance between the two poles is different, it is necessary to diverge the two poles of the universal charger at the same Angle.
Touch their two poles and look at the indicator light on the universal charger. If there is a red light, the two poles are connected correctly, if not, it is connected to the opposite poles.
Finally plug the universal charger into the plug-in board, there will be a red light flashing jump.