Hello Dave,
I don't think that it is the battery that is holding them up -- it is more likely to be the roll down door windows, and the associated changes in the aerodynamics. They have increased the battery capacity -- it will be between 17 and 23 kWh, but I'm not sure that this is adding unduly to the delivery time.
The gas version is supposed to be a ~600cc engine from an undisclosed Japanese microcar, and so things like cooling the radiator, and the transmission setup are new design issues -- and they would still have to solve the roll down windows, too.
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