UUMART RC Battery Charger Set for WLtoys V977 Helicopter(6x 3.7V 520mAh 25C Battery + 1x Battery Charger) The charger is capable of charging 6 batteries at the same time which effectively reduces your charging time. This battery charger set comes with 6 520mAh batteries and 1 battery charger. Perfectly compatible with your Hubsan H107 series quadcopter. Always keep the spare batteries ready so as to extend your playing time. All the batteries have passed strict quality test and can ensure long term use