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Would this not be the same idea as selling a car without an engine? Automakers are constantly making their engines better and a car engine made five years ago is certainly not nearly as efficient or well built as one now.  Its a good idea in theory but there are many many reasons the American car industry would never do this.  I am hoping they just focus on bringing the Ford focus electric's price point down.  If you start there everything else should follow.  I also doubt that a focus ev that can go over 100 miles on 1 charge will be that obsolete in 5 years.  I mean its been an over 2 year delay just to get the current Ford focus ev to market and there still having trouble.  Forget a replaceable battery lets just get the ev cars on the road.  How much would it cost just drop a new battery into a car?  Most car leases are also for 3 years meaning a lot of people get a brand new one long before the 5 year mark.