Aston Martin says they use 18650 format cylindrical cells in a 800V configuration for significantly quicker fast charging. If you couple similar batteries in parallel you retain voltage, and in series you double voltage. If high voltage is the key to charging, wouldn't it be as simple as to dynamically change the coupling/wiring to higher voltage for the duration of charging? Or am I missing something here? If you understand why dynamically switching the battery pack voltage wouldn't work for faster charging, please educate me. And also please explain why a fixed higher voltage setup would give faster charging (how is it any different from dynamically coupled)? If dynamic coupling would work, Tesla could match any charging voltage 800V or 400V on demand.