Tesla Motors has made the promised battery upgrade for its Roadster available via its online shop. For a price of $29,000, with a $5,000 downpayment, customers will receive an new battery pack that Tesla says stores roughly 40% more energy than the original battery, with an increase in total range of more than 35%. Since the original Roadster featured a 56 kWh pack and 245 miles of range, presumably the new pack is ~78 kWh with a resulting range of ~331 miles (533 km).
There is a “slight” increase in the battery weight, Tesla noted, but Tesla has managed to deliver the great increase in capacity within the same footprint.
The cost per kWh (~$372) is higher than a Model S battery due to the upgrades being almost entirely hand-built, and low-volume (only 2 or 3 per week). It also includes additional work to remove, upgrade, and reinstall the power electronics module (PEM), Tesla said.
Per the original announcement (earlier post), the Roadster 3.0 upgrade comprises three main elements: the higher capacity battery pack, enabled by higher capacity cells; a retrofit aero kit to improve aerodynamics; and a further reduction in rolling resistance. News and pricing of the remaining two elements (aero kit and RR) has not surfaced yet.
Tesla said then that it expected that the combination of the three would deliver a 40-50% improvement on range between the original Roadster and Roadster 3.0—i.e., between 343 and 368 miles. Tesla also said that there is a set of speeds and driving conditions under which Roadster 3.0 can drive more than 400 miles (645 km).