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The Level 3 CHAdeMO EVSE units are 480V DC up to 125A. Between 44 and 62.5kW.
Nissan has engineered the battery and charger to safely handle the capacity it has. Midway through the 2014 model year, they started using a more robust cell (so-called "lizard battery"), and they no longer recommend charging it to 80% regularly.
Our electric rate actually dropped a bit: from 19.2¢/kWh to 18.58¢/kWh. Our consumption increased from 478kWh to 824kWh; most /all of that due to charging the Leaf. So, we paid about $64 to drive the Leaf about 1400 miles (the billing date was the 15th, so I have to estimate this). That is about 4.57¢ / mile.
The losses during regen are almost entirely due to motor/charger/battery losses. I am sure the batteries can take it as fast as it is generated. Lead acid batteries benefit from a capacitor buffer, but lithium are fine. I think we will have hit peak regen for a grand total of about 1 second. Long gentle regen is what happens most of the time.
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