I have been charging my Model S both overnight and at work. I've read that the battery has both a limited calendar life and charge cycle life. I have the 60KWh battery, and I rarely get below 90 miles remaining (Ideal Range). I typically start out with 219 miles remaining and arrive at work with 196 miles remaining. I can use my free Level 2 charger at work to top it off, but it seems counterproductive if I am just using up one of the finite number of charge cycles.
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