Fascinating stuff from the CHAdeMo/SAE-QC support thread on the design intent behind the lifetime for the Model S battery packs!
Original post on the My Nissan Leaf forum:The info below comes from a Tesla engineer group leader named Lars.
Whereas the LEAF battery pack is series-parallel, composed of 96 cell-pairs wired in series, the Tesla arrangement is reversed: parallel-serial. 14 modules, each containing enough cells in series to generate the full voltage of 400V or so, with the 14 modules in parallel. Temperature of each of the 14 modules is tracked and controlled independently.
The design intent, not guarantee, is for the temperature-controlled battery pack to lose no more than 30% capacity over 18 years. Compare that to the disappointing capacity decline being reported for LEAFs after just one year in warm climates.
There will be adapters to allow both the 85 kWh battery, and the 60 kWh battery, if equipped with the Super-Charger option, to charge from CHAdeMo or SAE Quick Chargers. The 40 kWh battery will not have support for DC through the Tesla charging port.
My Nissan Leaf Forum View topic - Tesla Model S