Battery Test for the Hyundai Kona Electric: On-Site SoH Analysis

The Hyundai Kona Electric is among the most successful electric vehicles on the German market. It is offered in two battery variants: with 39.2 kWh and 64 kWh capacity. Since the traction battery is the most expensive component of the vehicle, its condition is largely responsible for the residual value. A conventional look at the odometer reading is not enough to assess actual wear in electric vehicles. Factors such as charging behavior (frequent fast charging vs. slow AC charging) and thermal stress influence the chemical aging of the cells.

A professional battery test provides the so-called State of Health (SoH). This value indicates how much residual capacity the battery still has compared to its original condition. For a Hyundai Kona Electric that, for example, is being returned after a three-year lease or sold privately, a certified SoH report is a decisive selling point. DIAVAG relies on a standardized process here that goes beyond simply reading the fault memory and delivers in-depth data on cell balance and capacity.

While many workshops merely query the fault memory, DIAVAG's Premium Battery Test includes a detailed analysis of the battery structure. The appraiser uses calibrated hardware to read real-time parameters from the battery management system (BMS). These include the voltage differentials between individual cell modules, the internal resistance, and the cumulative charge cycles. Good cell balance is an indicator of a healthy battery pack, while significant deviations can point to emerging defects or uneven aging.

The result is summarized in a BVSK-compliant PDF appraisal. This document contains not only the percentage SoH value but also an assessment of the charging curve and thermal stability. For the Hyundai Kona Electric, this is particularly important, as the vehicle has active thermal management whose efficiency is validated by the test. The fixed price for this premium appraisal is auf Anfrage, which represents a necessary safeguard given the investment involved in buying a used vehicle.

A key advantage of DIAVAG is mobility. The appraiser comes directly to the vehicle's location, whether a private garage, a dealer's lot, or a public parking space. This saves the vehicle owner time-consuming trips to a workshop and waiting for appointments at testing organizations like TÜV or DEKRA, which also often do not offer a comparably in-depth battery test for EVs. In the regions of Hamburg, Berlin, and Munich, DIAVAG guarantees an appointment within 24 hours.

The on-site inspection typically takes less than 15 minutes. In addition to the battery diagnostics, the appraisal includes standardized photo documentation, a paint thickness measurement to identify accident damage, and a check of tread depth and overall condition. Thanks to this holistic approach, the customer receives a digital appraisal the same day, signed by a senior inspector, meeting the highest formal requirements.

DIAVAG operates as a fully independent service provider. The company does not sell vehicles, broker insurance, or perform repairs. This independence is the prerequisite for classification as an inspection body under ISO/IEC 17020 Type A. For customers, this means the appraisal is created objectively and without bias. This is especially important in legal contexts such as inheritance matters, divorces, or insurance disputes.

Should disagreements arise over the vehicle's value, the BVSK-compliant appraisal provides a solid basis. It meets the requirements placed on expert services under the Judicial Remuneration and Compensation Act (JVEG). For specific legal questions, customers should always consult a lawyer or notary to clarify usability in individual cases. DIAVAG's technical documentation provides the necessary foundation for this.

A comparison with conventional providers helps clarify DIAVAG's positioning. While testing organizations primarily assess road safety as part of the periodic technical inspection (HU), DIAVAG focuses on the value-determining factors of electric vehicles.

Starting in February 2027, the EU Battery Passport will become mandatory for all new electric vehicle batteries with a capacity of 2 kWh or more. This digital passport is intended to contain information about the origin of raw materials, the carbon footprint, and above all the current condition of the battery. DIAVAG is already prepared for these regulatory requirements today. The data collected as part of the battery test for the Hyundai Kona Electric meets the future standards for transparency and traceability.

For fleet operators and dealers, this means future-proof documentation of their inventory. Through API integration with dealer management systems (DMS), commercial customers with a volume of 50 or more appraisals per month can fully digitize the process. This enables efficient residual value tracking and optimized marketing of used electric vehicles based on verified battery data.

The quality of an appraisal depends heavily on the hardware used. DIAVAG appraisers carry a special hardware case calibrated for the requirements of modern assets. For the Hyundai Kona Electric, the OBD2 scanner combined with proprietary diagnostic software is primarily used. This combination allows deep access into the control units, retrieving data that often remains hidden from conventional workshop testers.

In addition, a paint thickness gauge is used to check the body at defined points. Since the Kona is often used as a commuter vehicle, touch-up paint jobs following minor parking dents are not uncommon. The appraisal precisely documents these deviations. A digital multimeter is used to check the 12V onboard battery and other electrical components, providing a complete picture of the vehicle's electronics.

DIAVAG offers scalable solutions for commercial customers. Dealerships looking to professionalize the purchasing of used Hyundai Kona Electric models benefit from individual terms starting at 50 appraisals per month. Integration is seamless via a DMS API, allowing appraisals to flow directly into existing systems. This significantly speeds up the acquisition process and minimizes the risk of misjudging batteries during purchase.

DIAVAG also offers the hardware case, including the software license, to independent appraisers at a list price of auf Anfrage. This allows other experts to integrate the standardized DIAVAG workflow into their own portfolio and benefit from the technological expertise in battery diagnostics. Central signing by a senior inspector ensures the consistently high quality of the reports.