I, for one, still don't understand why to you want to swap batteries
Because I don't want to be tethered to a cable.
How's taking the batteries out, going to the charging station, swapping the batteries, returning and installing them back into the controller less convenient that just dropping the controller onto the recharging puck when it's not in use?
Because then I have to be constantly concerned about the state of the battery at any time. I have enough rechargeable devices to be worried about.