As the automotive landscape shifts toward electrification, the German Association of Automobile Dealers (VAD) has sounded an urgent alarm regarding the state of the used electric vehicle (EV) market. With potential buyers exhibiting significant hesitation, VAD President Burkhard Weller has called for a radical policy expansion: extending state subsidies for electric vehicles to include the secondary market. However, as the industry debates fiscal incentives, a more fundamental challenge remains—the "black box" nature of the traction battery. For the used EV market to truly flourish, the industry must pivot from government subsidies toward a standardized, transparent system of battery health certification.
The Call for Policy Expansion: VAD’s Proposal
The VAD’s proposal is rooted in a desire to democratize electric mobility. While the current state incentive program, which began on May 19, 2026, has provided a lifeline for new vehicle sales, it has left the used market largely untouched. According to Burkhard Weller, managing partner of a prominent dealership holding company, the current market dynamics are stifling growth.
“Only if young used electric vehicles are also subsidized can electric mobility quickly become affordable for broad sections of the population,” Weller argues. The VAD believes that the current "purchase reluctance" is not merely a matter of price, but a lack of confidence in the longevity of the vehicles’ most expensive component: the lithium-ion battery. By incentivizing the second-hand market, the VAD hopes to create a circular economy that makes EVs accessible to middle- and lower-income demographics.
The "Black Box" Problem: Combustion vs. Electric
For decades, the used car market operated on a set of well-understood, albeit imperfect, metrics. Buyers examined service logs, looked for oil leaks, checked timing belts, and assessed the general condition of the drivetrain. While this was always a game of educated guessing, the variables were predictable.
With electric vehicles, the paradigm has shifted. The internal combustion engine—a complex, mechanical beast—has been replaced by a simplified electric powertrain. Yet, this simplification brings a new, daunting variable: the traction battery. Prospective buyers are rightfully concerned about the degradation of battery capacity, which can translate into thousands of euros in potential repair costs. Unlike a worn-out clutch or a leaking water pump, the condition of a battery is not visible to the naked eye. This uncertainty is the single greatest barrier to entry for the used EV market.
Chronology of a Market Shift
The evolution of the used EV market can be traced through several distinct phases:
- 2015–2020: The Niche Phase. Electric vehicles were largely early-adopter luxury items. Used EV batteries were a secondary concern because the technology was still maturing.
- 2021–2025: The Scaling Phase. As EVs moved into the mainstream, the first generation of mass-produced electric cars began hitting the secondary market. Dealers and buyers alike realized they lacked the tools to verify battery integrity.
- 2026–Present: The Transparency Crisis. With the implementation of new, broader EV adoption mandates, the volume of used EVs has surged. The industry is now facing a "trust deficit," where buyers are holding off on purchases due to fear of hidden battery defects, leading to the VAD’s current demand for intervention.
Data and Reality: The State of the Market
A cursory look at leading European online marketplaces, such as mobile.de, reveals a startling discrepancy. Out of over 1.5 million vehicle listings in early October, only about 4.7 percent were electric vehicles. More tellingly, of those EVs, only 16 percent featured a "Battery Certificate."
This low adoption rate of certification is not necessarily due to a lack of technology, but rather a lack of process. Uploading a certificate requires extra effort from the seller, and in the current market, sellers are often incentivized to conceal rather than disclose technical limitations. However, as the market matures, this lack of transparency is becoming a self-inflicted wound. Dealers who provide certified battery health reports are seeing faster inventory turnover and higher buyer trust, yet the industry has yet to reach a critical mass of compliance.
Understanding the "State of Health" (SOH)
To navigate the used EV market, both buyers and sellers must understand the State of Health (SOH). The SOH is a percentage-based metric representing the current maximum energy capacity of a battery compared to its capacity when it was new.
- 100% SOH: This is a red flag. After several thousand kilometers and hundreds of charging cycles, a battery will naturally experience degradation. Any listing claiming a "100% SOH" for a car with significant mileage is likely misleading or falsified.
- The Plateau Effect: Batteries typically lose a small percentage of capacity quickly in the early stages, followed by a long, slow decline. This "plateau" is normal.
- The 70% Threshold: Generally, once a battery drops below 70% SOH, it is considered at the end of its automotive lifecycle.
The Role of Independent Certification
Leading the charge in battery diagnostics is the Austrian company Aviloo, which has set the industry standard for independent testing. Aviloo’s system uses a "traffic light" protocol—green, yellow, and red—to categorize battery health.
Crucially, these certificates are becoming more robust. As of July 2026, Aviloo introduced a guarantee: if the actual SOH after one year or 20,000 kilometers deviates significantly from the initial projection, the company provides a €3,000 compensation. This type of financial backing is the "gold standard" required to build consumer trust.
Furthermore, professional diagnostics now include cell voltage diagrams. By analyzing the "delta" (the difference in voltage between individual cells), experts can detect imbalances that indicate a failing battery module. While most manufacturers allow for 1mV resolution, some, such as certain Hyundai and Kia models, utilize a 20mV resolution, which can sometimes mask minor issues. This level of technical depth underscores why generic checklists are insufficient; specific, model-based research is essential for any serious buyer.
Official Responses and Implications
Government officials have been slow to respond to the VAD’s demands. Critics of the VAD’s subsidy proposal argue that government funds would be better spent on creating national standards for battery transparency rather than direct price subsidies. The logic is simple: if the government mandates a standardized, independent battery certificate for all used EV sales, market transparency will naturally lower the risk for buyers, thereby stimulating demand without the need for tax-funded subsidies.
The implications of this debate are far-reaching. If the industry fails to adopt a universal standard for battery certification, the used EV market will remain fractured and prone to fraud. Fraudulent listings—including those using AI-generated or doctored certificates—are already on the rise, proving that the market is currently a "wild west" of information.
Conclusion: A Path Forward
The path to a sustainable, high-volume used electric vehicle market is not through government-funded price support, but through the rigorous enforcement of data transparency. The VAD’s call for subsidies highlights a genuine economic frustration, but it misses the root cause.
Prospective buyers are not just looking for a lower price; they are looking for a guarantee that their investment will not become a "brick" in three years’ time. Whether through a state-mandated certificate or a mandatory industry-wide standard, the battery certificate must become as common and as essential as the vehicle’s title. Only when a buyer can pull up a QR-code-verified, tamper-proof history of the battery’s health will the "purchase reluctance" vanish.
Until then, the advice for the consumer remains clear: perform your due diligence, ignore the 100% SOH claims, and never purchase an electric vehicle without an independent, verified battery health report. The technology exists to make the used EV market safe, transparent, and profitable—now, the industry just needs to use it.
