Elon Musk explains why you shouldn't charge your Tesla battery to 100%

Electric car batteries should not, generally, be charged to 100%. Long-term, this reduces the battery's longevity, and Tesla cars actually charge up to 90% by default.
But if you're pressed for range, should you change this and charge up to 100%? Well, unless you absolutely must squeeze every bit of range out of your battery, the answer is still no. 
It's not just about battery degradation. In a recent Twitter exchange, Tesla CEO Elon Musk explained that regenerative braking does not kick i