DJI phantom 4 Parts Three Battery Parrallel Charger Board RC Helicopter Fast Charge for DJI Drone Battery and adapter are not included Function: This Chargher Board Can charge 3 batteries simultaneously. For DJI Phantom 4 Please notes: 1.do not touch the ceramic resistor of the charger board with your finger to prevent scald 2.when use the charger board only charge one battery , please plugged in CN4 position 3. when two battery charge at the same time , please plugged in CN3 and CN4 position 4.when 3 battery use at the same time , do not press the blue switch 5.After the battery is plugged in, please check the plug Pin if is plugged in the correct position