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The charger gets wired to the battery pack, so does the controller.
controllers that allow regen breaking are charging the battery pack in a very simple crude manner by allowing the still spinning motor to act as a generator and because it's going about the right speed to produce the right voltage for the pack it's output doesn't need to be converted, just throttled so you don't lock the wheel up, so it's pretty basic and crude, because unless you lived at the top of a long mouton you would never risk over charging from braking.
a charger on the other hand is taking power from the wall and converting it to the voltage that the pack needs and giving it a steady amperage for proper charging while monitoring the pack voltage to tell when it's getting close to full so it can start to taper it off.
BMS/Battery Management System's should be matched to the battery pack that they are being used for, there are a few generic ones out there that will work for a small range of battery packs but they need to be sized for the cells that you are using, the nice ones I've seen connect to the whole pack so they have a wire going to each cell in the pack, one of that design should be able to balance cells as they are charging by taking power from one cell and shunting it to another, there are also cheap ones that connect to each battery and are isolated there and those basically shunt power around the cell as it is charging once it is charged, extra energy is turned in to heat, this seems like a bad idea to most people because as the pack is reaching it's fullest state the weakest cell is the only one getting a charge and the rest of them are being shorted out, it's just a waste of energy altho it does work.
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