Source data: 3 batteries and support charging one QuickChange 2.0 battery in the Mavic Mini itself.
The battery charging Cup should be:
1. For two batteries (To charge the thirds there is the drone itself).
2. With two connectors for charging the Cup with the logic of operation: when you connect one charging cable, two batteries are charged in series, when you connect two charging cables, it is charged in parallel.
3. Supported QC 2.0 charging (as implemented in the drone itself).
4. When using the beaker as a power recoil device, there should also be support for QC 2.0

Currently, there are already chargers to charge 4 batteries at the same time, but only from a stationary electrical network. And simultaneously charge 2 batteries from the car network.
But as the Russians say "There is no limit to perfection!"

You are talking about the 3 battery charging hub right?

JodyB Posted at 12-14 22:10
You are talking about the 3 battery charging hub right?

I do not see the point in this in the charger for three batteries, as now, it will be enough if only two batteries are inserted into the charger - glass for batteries.