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Corsugone a écrit :Je ne savais pas que François avait fait un tour en Roadster Pas vraiment "Normal" ce président, en plus c'est pour les riches

(...)after driving 10,000 miles per year for five years, Roadster owners should expect to have about 70% of their original battery pack capacity remaining.

(...)the average Roadster battery pack will retain 80% to 85% of its original capacity after 100,000 miles of driving.

For the timeframe considered, 1-4.5 years, calendar life hasn’t had a noticeable effect on capacity. This may change as the vehicles get older.

While it’s clear from laboratory testing that operating the cells at high temperatures has a negative impact on battery life, the study found no significant difference among Roadsters in different climates. From this, it appears that Tesla’s active thermal management system, along with other features such as limiting power when the battery pack is hot, protects the cells from variations in climate. As we have relatively few vehicles above 40,000 miles with climate data, climate-related capacity effects may emerge as more data is collected.

1. Batteries
The original Roadster battery was the very first lithium ion battery put into production in any vehicle. It was state of the art in 2008, but cell technology has improved substantially since then. We have identified a new cell that has 31% more energy than the original Roadster cell. Using this new cell we have created a battery pack that delivers roughly 70kWh in the same package as the original battery.

2. Aerodynamics
The original Roadster had a drag coefficient (Cd) of 0.36. Using modern computational methods we expect to make a 15% improvement, dropping the total Cd down to 0.31 with a retrofit aero kit.

3. Rolling Resistance
The original Roadster tires have a rolling resistance coefficient (Crr) of 11.0 kg/ton. New tires that we will use on the Roadster 3.0 have a Crr of roughly 8.9 kg/ton, about a 20% improvement. We are also making improvements in the wheel bearings and residual brake drag that further reduce overall rolling resistance of the car.

Summary
Combining all of these improvements we can achieve a predicted 40-50% improvement on range between the original Roadster and Roadster 3.0. There is a set of speeds and driving conditions where we can confidently drive the Roadster 3.0 over 400 miles. We will be demonstrating this in the real world during a non-stop drive from San Francisco to Los Angeles in the early weeks of 2015.

Appointments for upgrading Roadsters will be taken this spring once the new battery pack finishes safety validation. We are confident that this will not be the last update the Roadster will receive in the many years to come.