Thinking of picking up the budget Tesla Model S? Think again: the electric automaker just announced that it won't be sending its 40kWh battery pack option into production, citing a lack of customer demand. Customers who opted for the lower range configuration will still get a car, of course, but it will be a 60kWh machine with software restrictions on range. It sounds like a raw deal, but Tesla promises customers that the artificially limited Model S will reap unexpected benefits from the battery swap -- that is, improved acceleration and
