Why dont they have changeable batteries on electric cars instead of slow plug-in charging?

each car could have a standard size changeable battery pack that you could change for a fully charged one at nearest "gas station", task easily automated. and voila, you have a charged electric car in minutes instead of hours. gas stations would receive empty battery packs keep them until charged and return to use,... show more each car could have a standard size changeable battery pack that you could change for a fully charged one at nearest "gas station", task easily automated. and voila, you have a charged electric car in minutes instead of hours. gas stations would receive empty battery packs keep them until charged and return to use, clients would pay the electric bill and for replacing dead batteries everybody wins
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