Just read some estimates of maximum re-charging cycles for various levels of EV battery high charge/low charge for the New Nissan Leaf w/40kWhr battery pack, 2.0. The Nissan Leaf 2.0 is embroiled in "Rapid-gate" right now, due to its battery cooling, dependent only on air cooling & no thermal management liquid cooling. Possible Nissan reliance on air cooling, might be due to lower speed limits, shorter distances traveled, & lower temperatures in Japan.
With careful charging up to only 70% & careful discharging to no less than 20% charge, one can expect as many as 6000 useful charges. However, allowing charging to 80%, will lead to only 3000(+?) cycles. With wild abuse & assault against EV batteries, constant charge to 100% & dis-charge to 0%, only 500 working cycles can be expected. Again, this is dependent on the Japanese conditions of lower speed limits, 60mph & lower(?), shorter distances traveled AND lower ambient temperatures. In addition, careful Leaf EV battery temperature management may include cooling periods of 10 minutes, after traveling to a charge station AND BEFORE beginning to charge, even in cool weather below 50 degF. Higher ambient temperatures will extend cooling periods BEFORE charging & during charging. It appears that to maintain the potential for long battery life, Nissan has imposed a strong decrease in battery charge kW, in the second & following charges, to help cool EV batteries during longer trips needing multiple charging sessions. Of course, this means drastic increases in battery charge time periods, really crippling any ability for "quick-charge & away we go" conduct.
Now that Nissan Leaf is turned loose into the uncaring hands of Americans, we can expect lots of of complaints of "battery failures", as Americans try to drive the Leaf like an internal combustion engine (ICE) vehicle.
Now EVs using thermal management liquid cooling ain't off the hook, either. Americans, who still will drive their EVs like ICE vehicles, must be reminded that even liquid battery cooling has its many limits & EVs cannot be driven like ICE vehicles. But such warnings are hard to hear, as Tesla drops the hammer on its strong accelerating Model 3 & 60+ kW-hr battery packs enter the market in the Chevy Bolt, Hyundai Kona, Kia Niro & many(?) others.