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This is How Fast The Electric Cars Batteries Age

Geotab has collected data from electric cars worldwide. On average, their batteries lost 2.3 percent of their capacity a year. Here are the factors that shorten the life span.

The telematics company Geotab offers, among other things, its services to vehicle fleets, and now they have collected the company’s statistics on how the electric cars’ batteries degenerate over time. The data, which together covers 1.8 million days, comes from 6,300 electric cars around the world.

It shows that the batteries on average lose 2.3 percent of their capacity per year. This means that an electric car with a range of 241 kilometers after five years has lost about 27 kilometers of that capacity. However, according to Geotab, the annual loss means that most batteries will survive the expected life of the vehicle itself.

Their study shows that battery chemistry, together with the efficiency of cooling / heating systems with air or liquid, affects the degree of degeneration. Among other things, they make a comparison between a Tesla Model S and a Nissan Leaf, where Teslan, with its liquid cooling, lost 2.3 percent per year – against 4.2 percent for Nissan’s passive air cooling system.

The loss over time is not necessarily linear, although this is generally the case. Early on, the battery may suffer a substantial loss, which is then followed by more moderate losses. And towards the end of his life comes a marked fall. But the study shows that regular use has no effect on the taper. However, the local climate is decisive – and it is batteries in hot regions that degenerate the fastest.

Regular quick charges accelerate the aging process, and in combination with a hot climate, the study reported a loss of ten percent after six years. Geotab recommends owners who want to maintain the service life to keep the charge between 20-80 percent of the battery capacity. There is also a practical reason – because above and below this the chemistry is not able to deliver its full power, this so significantly that it affects the driving experience. That’s what Geotab claims.

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