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An electric car can achieve 100-150Wh / mile, then it can drive ~6.5-10 miles per kWh of usable capacity in the pack, then the pack size required to go 400 miles would be 40-60kWh of useable capacity. The best battery cells are 95-97% DOD so the total capacity adds 3-5% at best to that.
The DBM Energy Kolibri (Hummingbird) battery is available in a 99kWh pack with 97% DOD, so that has about 96kWh of usable capacity. It weighs about 350kg and it has passed all the official tests with flying colors.
So, obviously 400+ miles on a single charge is quite possible, and doing so depends on the efficiency of the chassis. Dave Cloud's Dolphin, the Illuminati Motor Works '7', the SIM-LEI, and the Edison2 VLCe have all achieved the level of efficiency needed to do this. And I hope to build the CarBEN EV5 and possibly achieve this efficiency, as well.
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