Many people still hold the belief that electric vehicle batteries need to be replaced after a few years, incurring high costs and risks, much like smartphone batteries. This impression has persisted for years, but it is fundamentally based on a flawed analogy. The misunderstanding surrounding electric vehicle batteries does not stem from a lack of data, but rather from a tendency to compare them to smartphones.
First, it is crucial to clarify a key fact: the batteries used in smartphones and electric vehicles are based on different chemical compositions. Modern smartphones primarily use LCO (lithium cobalt oxide) batteries. The main advantage of LCO is its high energy density, allowing for thin and lightweight designs that meet the extreme size and weight demands of smartphones. However, this comes at a clear cost—structural stability is lower, making it unsuitable for prolonged, high-cycle use.
This is not a mistake, but rather a product strategy. Smartphones are designed to be replaced every few years, with batteries optimized for immediate performance rather than a lifespan of twenty years. Daily charging from low to full, repeatedly completing full charge-discharge cycles, combined with minimal active cooling, naturally accelerates battery aging. Manufacturers are well aware of this, hence they offer paid battery replacement options as part of the product lifecycle.
In contrast, electric vehicles take a completely opposite approach. The mainstream cathode chemistry for vehicle batteries is NMC (nickel manganese cobalt) or LFP (lithium iron phosphate). The commonality between these two is not extreme energy density, but rather stability, durability, and the ability to withstand long-term cycles. Particularly with LFP, while the range performance may not be the most impressive, its longevity and safety reflect the engineering mindset of automakers: they prefer to sacrifice some performance for a longer lifespan.
In addition to the different chemistry, electric vehicles also have a layer of protection that smartphones lack. The entire battery pack is equipped with a comprehensive thermal management system, maintaining temperature within an ideal range over the long term; the battery management system deliberately limits the upper and lower limits of charge and discharge. The 100% displayed on the dashboard does not indicate complete depletion; similarly, the 0% displayed does not represent an absolute limit. These invisible conservative designs are the reasons why batteries can age gradually rather than deteriorate rapidly.
The usage patterns also differ significantly. Smartphones typically complete a full cycle almost every day; electric vehicles, for the most part, only undergo partial charge and discharge, such as charging from 40% to 80%. For the battery, this constitutes gentle operation, causing far less damage to the cathode structure compared to the ‘deplete and recharge’ rhythm of smartphones.
These differences are already reflected in real-world data. Research from Geotab, which analyzed a large number of electric vehicles in operation, found that the average capacity degradation rate of modern electric vehicle batteries is only about 1-2% per year. At this rate, a battery would still be practically usable after 20 years. In many cases, it is the aging of the vehicle body, technological obsolescence, or disproportionate maintenance costs that lead to replacement, while the battery itself can continue to function.
Therefore, the notion that ‘the greatest risk of electric vehicles is the battery’ is largely a psychological projection. People mistakenly apply their experiences with smartphone batteries to a completely different engineering product. Smartphone batteries have short lifespans because they are designed to be short-lived; electric vehicle batteries last long not as a miracle but as a result predetermined by their chemical choices from the outset.
Once this point is understood, battery anxiety loses its foundation. What is likely to be replaced first is often not the old battery, but the entire vehicle.
