Charging a series of Nissan Leaf Li-Ion Batteries
Li ion batteries are charged with balancing in mind. 







simulate this circuit &ndash; Schematic created using CircuitLab

In the schematic imagine that the voltage sources are batteries. In the first schematic a bunch on cells are in series. The cells are charged by some high current source. The cell voltages are monitored by balancing circuitry. The circuitry will bypass some charge around cells that are more charged than others. The circuitry reports to the high current source letting it know how the cells are doing and what mode to charge the cells in. The starting mode is constant current and when the cells reach a predetermined voltage the mode switches to constant current. 

This setup scales when adding more cells in parallel. 

You would need to buy a charger that connects to the batteries as described. That can talk to a charging station. That supports balancing lithium ion cells.