This makes sense--it explains why it takes as long to charge my mobile phone as a model S. Obviously different chemistries can charge at different rates, and t

This makes sense--it explains why it takes as long to charge my mobile phone as a model S. Obviously different chemistries can charge at different rates, and the power supply and cooling needs to scale with the battery capacity, but if these are scaled then two batteries which use the same cells will recharge in the same time regardless of how many cells are in the battery. I suspect Tesla's grid storage already proves this point.