I don't know whether Tesla batteries are actually better than average. What Tesla absolutely does better than average is their battery management system. Tesla

I don't know whether Tesla batteries are actually better than average. What Tesla absolutely does better than average is their battery management system. Tesla does an exquisite job of keeping their batteries at the optimal temperature and never overcharging them or charging them too fast. Any lithium battery -- even a bad one -- will last much longer with a great BMS.