SMAKN&reg; B3 AC 100-240V 2S-3S Cells 7.4V 11.1V Lipo Battery Balancer Charger DJI Phantom Internal 110-240V AC switch power. Compact and light balance charger for 2 to 3 cells of Li-Po battery. High precision balance circuit can supply balanced current up to 800mA per cell. The balance function ensures charging safety. Safe and convenient.