Good question! I found the following interesting:
http://batteryuniversity.com/learn/article/how_to_prolong_lithium_based_batteries
Anyway, looks like it is possible to get several thousand cycles from Li-ion battery by only charging it to 40% capacity or so, and is also important to keep the battery cool (Powerwall has liquid cooling (whatever that is)). Maybe they are going to overprovision battery capacity so they can make them last that long.
Good question! I found the following interesting:...
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