DJI only makes battery chargers that charge one battery at a time. If using one of their battery charging hubs, you'll be able to connect 4 batteries at a time. That makes charging more convenient since you won't have to swap each battery as they finish charging.Does DJI make one that charges all at once, or is it just one at a time?

If the best means the fastest, then I think the Yx battery charger is the best way to go. It can charge 3 batteries in 1 hour.What is the best system for charging?

The charger mentioned above can be found on AMAZON HERE
This charger is the fastest on the market and have an OLED Display which show you the voltage and the load current and similar to the yx Charger will load 3 Mavic Batteries and the controller simultaneously 
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