The standard charger works. Bien, but if you need want to charge several batteries, it can be frustrating waiting for the battery to charge the ability to charge. Four batteries at the same time can be liberating and get your drone back in the air quickly easy to use and works. Bien, Music charges more than one battery at a time and charges them quick, fast delivery works just as advertised. I am able to charge all three of my evo 2 pro batteries all at once and not have to worry about having to charge each one separately.