New data reveals that electric vehicle batteries are holding up better than previously anticipated, challenging earlier concerns about their longevity and cost of replacement. Analysis of thousands of vehicles shows that initial degradation is less severe, and the end-of-life decline is occurring later than initially projected. This information should alleviate concerns for potential EV buyers.
Fifteen years ago, as modern electric vehicles began to appear on roads, uncertainty surrounded their large, expensive lithium-ion batteries. Questions about longevity loomed, as these batteries were designed to last far longer than the smaller, cheaper batteries found in smartphones or internal combustion engine vehicles. Estimates for battery pack lifespans ranged upwards from seven years, a concern given that the average car on the road is older than that.
This discrepancy made potential EV buyers hesitant. Batteries come with warranties, but these don't necessarily span the entire life of the vehicle. A high-voltage battery failing mid-life could necessitate a costly replacement, potentially ranging from $5,000 to $20,000. These anxieties have been partially put to rest thanks to new data emerging from the increasing number of EVs on the road. \Two types of aging affect lithium-ion batteries. Calendar aging causes degradation over time, reducing the battery's energy capacity even when in storage. Cyclical aging, influenced by charging and discharging cycles, also contributes to degradation. This means some energy loss is inevitable regardless of usage patterns. However, the degradation isn't a linear process. Recurrent, a research firm collecting data from over 30,000 EV drivers, observes an initial rapid decline, followed by a long leveling-off period, and then a more noticeable decline towards the end of the battery's life. Liz Najman, the director of market insights at Recurrent, compares this to breaking in a pair of shoes: they initially feel stiff but soften over time, offering consistent performance before ultimately wearing out. Regarding EV batteries, two key observations have emerged. Firstly, the initial drop-off in capacity isn't as severe as initially feared. Secondly, the sharp decline signaling the end of life is occurring over a much longer timeframe than anticipated.\Adam George, vehicle services director at Cox Automotive, which operates used car auctions, notes a significant increase in used EVs for sale, reflecting the surge in production a few years prior. The expectation of significant battery degradation within the first one to three years of ownership hasn't materialized. George points out that many 2-, 3-, and 4-year-old off-lease vehicles coming back to the market retain battery health scores well above 95%. This is due in part to sophisticated software and battery management systems designed to mitigate early degradation and maintain consistent range for drivers. This translates to an initial capacity drop of around 5%, if that, in what's known as the S-curve of battery degradation. Further, Cox Automotive's testing of nearly 80,000 EVs revealed an average battery health of 92%. While this dataset is skewed towards newer vehicles, data from Recurrent offers additional insights. Najman acknowledges a limited dataset due to the relatively small number of EVs older than a decade and some older models lacking connectivity to their network. However, among EVs aged 10 years or older, only 8.5% have required battery replacements. More than 90% are still operating on their original batteries. Recurrent's analysis of EVs with over 150,000 miles further challenges previous expectations. Those vehicles retaining at least 83% of their original range despite such significant mileage show an impressive resilience. While defects can lead to early battery replacement, this is covered by warranties, mitigating the financial burden on owners, much like engine or transmission failures in conventional vehicles
Electric Vehicles EV Batteries Battery Life Battery Degradation Used Evs
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