Numerous tests and private experience of car owners have shown that electric vehicle batteries are quite tenacious – they do not degrade as quickly as originally thought.
And one of the owners of the Tesla electric car decided to confirm this once again: in his video blog, Branden Flash shared some experience in owning a Model S 70D liftback. His car was released in 2015, and to date, the car has traveled 146,000 miles (235,000 km) and has survived more than 1,000 charge cycles (more precisely – 1014).
By calculations, Flash found that over 5 years his Tesla battery retained about 83% of its original capacity. Thus, for the year the battery “sagged” for about 3.4% or 1.7% every 15,000 miles (almost 24.2 thousand km). And this despite the fact that the car was operated quite actively: on average, Americans drive 15,000 miles (24.2 thousand km) a year on their cars, while Branden drove exactly twice as much every year – 30,000 miles (48.3 thousand km).
How did the owner make the calculations? Based on battery capacity, power reserve measurements and power consumption. The new Model S70D had an actual battery capacity of 66.5–68.8 kWh (full – 71.2), and in one of the last trips the auto used up the entire range of the car (it was possible to drive 335.1 km), which took 55,7 kWh of energy. After that, 4 kWh remained in the “bins” of the battery, and if you add both values, it turns out that now the actual battery capacity is 59.7 kWh, while the on-board electronics determined the used reserve in this particular battery as 58.4 (full – 62,4). Thus, the battery capacity for all time decreased by about 6.8-10.4 kWh (within 12-17%).