2023-04-28 08:54:00
If an electric car does not require as many revisions as a conventional thermal vehicle, there is nevertheless an essential element not to be neglected, it is the battery pack.
The batteries of electric vehicles, like those of any electronic equipment, degrade. Over time, their capacity decreases and affects the autonomy, the recharging speed decreasing in stride. The general rule is that below 70% capacity, the battery becomes a handicap for the vehicle. For example, most car manufacturers offer an 8-year warranty for the batteries, which is much longer than the warranty for the vehicle itself.
But there are exceptions when it comes to longevity, as Tesla shows. The American manufacturer recently published its annual report, Impact Report 2022, a chapter of which is dedicated to the degradation of its battery packs. In this case, the data mainly concerns the Tesla Model S and X, the brand’s two oldest models.
Thus, Tesla claims that the degradation of the capacity of its batteries is only 12% following 200,000 miles, or exactly 321,868.8 km traveled. This is 2% more than the figure provided in the report Impact Report 2021. Of course, this attenuation varies depending on the model and the battery pack.
According to the website Electrek, always very well informed, the 90 kWh packs would degrade faster than the 85 kWh at Tesla. Analyzing previous Tesla data, Electrek noticed in 2021 that the 90 kWh battery “was starting“with a useful capacity of 85 kWh and that it was losing”on average regarding 6 kWh following 20,000 kWh or 235 cycles“, i.e. more than 96,560 km. However, the degradation of the batteries in 90 kWh “also seems to fade with time and mileage“, once more according to Electrek.
As for the 85 kWh battery, it starts with a useful capacity of 80.5 kWh and “drops on average to around 77 kWh following 20,000 kWh“. (source Electrek)
Concerning the most recent models, the Model 3 and Y, the first observations show a degradation of less than 10% following a little more than 160,930 km traveled and less than 15% following 321,000 km, knowing that a low many of these two models achieved such mileages.
Preserve your battery, and therefore autonomy
Just like on a smartphone, the battery of an electric vehicle is designed to last as long as possible provided certain rules are followed. Thus, we will avoid being below the 20% mark to recharge, and we will limit the recharge to 80% of the battery capacity. Another tip, it is better to favor slow charges (maximum 22 kW) whenever possible, although this can be frustrating.
It is also advisable not to leave your electric vehicle stationary for too long in a parking lot, to avoid repeated acceleration and to restrict the use of heating and air conditioning.
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