This item rocks! It figures out which battery it can return to operation the fastest, and charges that first and with the highest power. Two batteries charge at lower power but still at great speed in parallel. The only missing point is one more port for a fourth battery ensuring continuous operation - for that I had to buy an DJI SDC cable and a DJI PowerStation 500. The charger fits well in the Matrice 4E case where the original item and bar used to be. PS. I normally do not buy anything that doesn’t say DJI on it, but this is a rare exception.