There was a time when people thought that NiCads and NiMh needed to be treated with kid gloves for "memory effect" and "number of cycles." Many still think that but most research says that it isn't true. The chemicals will be harmed by heat but there is no memory effect and if heat is managed the number of cycles isn't important either. Why do I bring this up, it also seems to be applying to LIon technology. Chargers are getting faster and faster and with few exceptions batteries aren't suffering too much. There's a Tesla that has been rapid charged for 400k miles. I think they said it's on the second battery pack but still 400,000 miles. Battery technology hit a stagnant point but once enough minds start pushing the envelope we are going to see some major changes. The only thing I don't really understand is why DC fast charging is faster. The car converts the AC to DC anyway so why does it matter? The only thing I an think is that they are using poor or cheap converters in the car. I personally still don't want one. Well secretly I crave a Volt and always have, but not really. I want my Elio. edit----- also note that the Tesla like many laptops and other largish form devices uses a standard LIon cell. It's the 18650 if I recall. Mass production and standardization always helps. Someone with the right equipment could build a Tesla battery pack in their garage. Improvements in the 18650 will directly improve electric cars. Buy a flashlight off Ebay with one in it to toy with.