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A Tesla owner says he was locked out of his EV after its 12-volt battery died amid the Texas heat
(www.businessinsider.com)
This is a most excellent place for technology news and articles.
The Leaf is pretty much the worst option you can get. There are plenty of others, cheaper, and better, that actually have thermal management on the pack. Unless you're buying used, in which case the Leaf can be fairly good value, if all you're doing is city driving.