Got a basic question on EV design. Background: I want an EV but do not want to pay $90K+ for a Tesla or have to charge a Leaf every 70-80 miles. Now, Nissan says the Leaf uses a 48 cell battery to power it. My question - why not 144 cells, configured as 3 batteries that can be charged in parallel (same time will be required for charging) and perhaps a selector switch on the dash for which battery I want to use while driving (1, 2 or 3). The range immediately goes up to around 225 miles. Seems like we already have the technology and engineering capability to do this. Higher weight should help pull the CG lower, too. Any idea what is stopping the manufacturers to get a 200+ mile range using this technique? Can this be done as an after-market upgrade? Has anyone done this? With 6 batteries the range could go over 450 miles, comparable to gasoline cars. What is the trade-off point?