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The home battery needs to reside in the vehicle, with the vehicle connected to the home when not in use. There is no sense in doubling the expense and resource consumption in batteries when a single set could perform double-duty.
I'd like to see batteries become more standardized and modular. Pull a battery unit out of the car and put it into the lawn mower. Get rid of individual batteries for every application and make the most use of that expensive investment in the vehicle. By making them modular, a vehicle could be purchased with a limited range, with the ability to expand the range as funds become available. This reduces the cost to enter the EV world while allowing for a path of expansion as the need arises. Not everyone needs the 250 mile range of a Tesla, and not everyone can get by with the limited range of the Leaf.
Modularity is the future. Lets build it now.
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