micro FPV needs very light batteries (5-15g), and typical battery run times are 2-3 minutes.
If you want to fly a lot, you need to charge a lot of batteries. To charge multiple batteries at once, you can either use dedicated multi-channel 1S charger like the Hitec X4 Micro, or you can use serial or parallel charging adapters to connect a bunch of batteries to single port of a programmable charger. 
If you have a 4-port charger that can charger up to 6S, you can use four 6-way serial cables to connect 24 1S packs to this charger, and charge each of them individually to the target voltage.