This is why we should be focused on PHEVs, not BEVs. PHEVs use 1/10th the batteries, batteries cost 1/10th, take 1/10th the energy and time to charge, but provide electric driving for 90% of trips.
If we build 10 PHEVs with the batteries it would take to build one BEV, instead of saving 100% of one vehicle's fuel usage, we could build 10 PHEVs and save 10 x 90% = 900% fuel usage.
If we build 10 PHEVs with the batteries it would take to build one BEV, instead of saving 100% of one vehicle's fuel usage, we could build 10 PHEVs and save 10 x 90% = 900% fuel usage.