Polestar 2 Battery Test: SoH Analysis and Mobile Value Appraisal

The Polestar 2 is based on the Compact Modular Architecture (CMA) and uses state-of-the-art lithium-ion batteries with capacities ranging from 69 kWh to 82 kWh. Since the battery is the most expensive individual component of the vehicle and can account for up to 40 percent of its total value, a detailed assessment is essential with every change of ownership or insurance claim. A simple look at the range display on the dashboard isn't enough, since it's heavily influenced by driving profile and outside temperature.

An independent battery test provides the so-called State of Health (SoH). This value describes the remaining capacity compared to when new. For the Polestar 2, this is particularly important, as cell degradation can be accelerated by fast charging (DC) or extreme discharging. A DIAVAG appraisal creates an objective data basis here, serving as a price anchor in negotiations for both private sellers and commercial fleet operators. Standardizing the process ensures that the results are reproducible and comparable.

Unlike conventional diagnostics, which often just read fault memory, DIAVAG's Premium Battery Test includes an in-depth analysis of the high-voltage storage system. The appraiser uses calibrated hardware to extract real-time parameters directly from the Polestar 2's battery management system (BMS). This assesses not only the SoH as a percentage, but also cell voltages and cell balance. A large difference between individual cell voltages can indicate emerging defects or uneven aging, which reduces performance over the long term.

In addition, cumulative charging amounts (AC vs. DC) and the number of charge cycles are analyzed. This data is crucial for understanding the vehicle's usage history to date. A Polestar 2 that was primarily charged at fast-charging stations often shows a different wear pattern than a vehicle that was mostly charged gently at a home wallbox. The Premium Battery Test is an integral part of the auf Anfrage premium appraisal and offers a level of detail that is indispensable for valuing electric vehicles.

A key advantage of DIAVAG's service is its mobility. The appraiser comes to the asset - whether in an underground garage, at a car dealer's yard, or at the harbor. This saves the customer time and logistical effort, as the vehicle doesn't need to be transported to a specialized workshop. The entire inspection workflow is optimized for efficiency: on-site data collection usually takes under 15 minutes.

During the appointment, the expert performs standardized photo documentation and uses a paint thickness gauge to check the body for accident damage or repainting. However, the focus is on electronic diagnostics via the OBD2 interface. The collected data is transmitted encrypted to the DIAVAG platform, where it's validated by a senior inspector. The finished PDF appraisal is delivered the same day. This process guarantees fast turnaround, which is especially valuable for short-notice sales decisions or inheritance matters.

The appraiser's independence is the foundation for the legal usability of the results. DIAVAG acts purely as an inspection body and sells neither vehicles nor insurance or repair services. This strict separation meets the requirements of ISO/IEC 17020 Type A, the highest level of independence for inspection bodies. All appraisers employed are qualified according to BVSK standards, ensuring the technical depth and compliance of the appraisals.

In legal contexts such as divorces, inheritance disputes, or insurance claims, such an appraisal is often the only recognized basis for valuation. The reference to the Judicial Remuneration and Compensation Act (JVEG) underscores its suitability for court proceedings. For additional tamper protection, DIAVAG optionally offers a notarial hash on the Polygon blockchain. This digital fingerprint irrevocably proves that the appraisal was not altered after creation. For specific legal questions, clients should always consult a specialized lawyer or notary.

Many vehicle owners primarily associate appraisals with organizations like TÜV or DEKRA. While these institutions do excellent work in the field of periodic technical inspection (HU), DIAVAG's approach differs in its specialization in mobile value appraisals and in-depth battery diagnostics. Conventional inspection centers often offer only basic diagnostics that only superficially touch on the actual health condition (SoH) of a Polestar 2.

The table illustrates that DIAVAG fills a gap created by the increasing complexity of electric mobility. The combination of mobility and technical depth in the battery test is a particular unique selling point.

Starting in February 2027, the EU Battery Passport will become mandatory for all new batteries in electric vehicles. This regulation aims to increase transparency across the entire supply chain and lifecycle of a battery. Information on CO2 footprint, material composition, and current condition must be digitally accessible. DIAVAG is already prepared for these requirements today and integrates relevant data points into its appraisal structure.

For Polestar 2 owners, this means long-term protection of resale value. A complete record of battery condition will become the standard for every transaction in the future. Anyone who relies on professional battery tests today positions their vehicle advantageously in the market. Compliance with GDPR and data storage within the EU are a given, protecting the privacy of vehicle owners while meeting the regulatory requirements of the EU Machinery Regulation and other standards.

Transparency begins with pricing. DIAVAG deliberately avoids complex fee schedules or hidden travel costs within the areas of Hamburg, Berlin, and Munich. For a comprehensive value appraisal of a Polestar 2 including the Premium Battery Test, a flat rate of auf Anfrage applies. This price covers the entire process: from mobile arrival, through the technical inspection, to the creation of the BVSK-compliant PDF report.

For standard assets such as combustion-engine cars, boats, or cargo bikes, the flat rate is auf Anfrage. This predictability is especially important for private customers seeking a reliable decision basis without financial risk. Dealers and fleet operators who reach a volume of more than 50 appraisals per month receive individual terms and can integrate the data directly into their dealer management systems (DMS) via API. This scalability makes DIAVAG an efficient partner for professional market participants in stock valuation as well.

The service is aimed at a broad range of parties. Private sellers use the appraisal to demonstrate the quality of their vehicle and justify a higher sales price. Buyers, on the other hand, protect themselves against hidden battery defects that could cause high costs after purchase. Demand is also high in the commercial sector: dealerships use mobile appraisers to quickly and precisely assess trade-ins without tying up their own workshop capacity.

Lawyers and notaries turn to DIAVAG when it comes to objective valuation in client matters. Whether it's an inheritance where a Polestar 2 is part of the estate, or a divorce involving asset division - the independent appraisal provides the necessary legal certainty. Insurers also benefit from the quick availability of appraisers in claims cases, to promptly determine replacement value. The combination of technical precision and legal compliance makes the appraisal a versatile tool for all parties involved.

The Polestar 2 uses a liquid-cooled battery system integrated into the floor plate. The architecture is designed for high charging power of up to 150 kW (or 205 kW in newer models). While the hardware is built to be robust, the cell chemistry is subject to natural aging processes. Factors such as calendar aging and cyclic aging interact here. A professional battery test analyzes how effectively the thermal management has performed and whether the cells are operating within their specifications.

The area of cell balance is particularly critical. If individual cell modules show significantly lower voltage, this can limit the usable overall capacity of the battery, since the BMS bases the discharge process on the weakest cell. The DIAVAG test makes these discrepancies visible. For the owner, this is important evidence for potentially asserting warranty claims against the manufacturer before the warranty period expires. Detailed documentation of these technical parameters is therefore not only a selling point, but also an instrument for quality assurance.