This is the charger I bought for the battery of the CrystalSky
From Amazon
Coming Data DC 17.5V DJI Phantom 3 / 4 Drone Quadcopter Fast Lithium Battery Charger
Works perfect
From Amazon
Coming Data DC 17.5V DJI Phantom 3 / 4 Drone Quadcopter Fast Lithium Battery Charger
Works perfect