The DJI Phantom 2 Battery Charger is a charger for the DJI Phantom 2 Quad copter"s 11.1V, 5200mAh slot-in lithium-polymer battery. Unlike typical RC aircraft battery systems, this charger only requires a single DC power connection between itself and the battery. Power regulation is handled within the battery eliminating the need for a separate balance lead. For this reason, this charger should not be used with other RC aircraft batteries. Use as a replacement part or keep as an extra in case you want to charge multiple batteries at once Power management accomplished within Phantom 2 Quad copter Battery - no separate balance leads to connect