Electric car battery in general should not be charge to 100%, in the long run, this will reduce the service life of batteries. In fact, tesla motors by default charge to 90%.
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do not just because the battery aging, tesla CEO elon recently & middot; Musk, explained that if charge to 100%, then the braking energy recovery system is unable to work, this means the car's energy efficiency is low, so he suggested that the best charging to 90% ~ 95%.
braking energy recovery system is the braking energy into electrical energy, and can extend battery life. The effectiveness of its varied from many factors, but there are reports that the system can will increase tesla motors range up to 30%. Will, therefore, may actually and charging the battery to 95% to 100%.