Battery Value in Electric Cars: A Guide to Health Checks When Buying Used

Turkey's used electric vehicle market truly came to life for the first time in 2026; models such as the Togg T10X, Tesla Model Y, BYD Atto 3, MG4, Renault Megane E-Tech, Hyundai Kona and IONIQ 5 are now frequently seen in dealerships. So when buying an electric car, what replaces the questions you ask when buying a petrol or diesel vehicle — "timing belt or chain, is it leaking oil"? There is a single criterion: battery health, or SoH.

In this guide, we walk step by step through how to read a battery health report when buying a used electric car, what manufacturer warranties cover for the battery, and range checks during the test drive.

What Is SoH and How Is It Read?

SoH (State of Health) is the percentage expression of the battery's current capacity relative to its factory-output capacity. A SoH of 100% indicates the battery is as it was at zero kilometers; a SoH of 80% means one fifth of the original capacity has been lost. Think of it practically: a vehicle with a SoH value of 85% delivers roughly 15% less than its advertised range.

When reading a SoH report, looking at a single percentage is not enough. Cell imbalance must also be on the checklist; imbalance between cells can lead to future range loss and performance problems. In used listings, the vehicle's charging history should be evaluated as part of the report, just as much as the battery value.

Four Practical Ways to Check Battery Health

  1. Compare the range estimate with real-world use. Ask the seller how many kilometers the vehicle goes on a full charge under normal driving conditions. A significant deviation from the manufacturer's claim is a clear warning sign.
  2. Have an OBD-based SoH measurement done. Many brand-independent applications can read the SoH percentage directly from the vehicle's OBD port or its own screen. This measurement must definitely be done before purchase.
  3. Ask about the charging history. A vehicle that has been consistently DC fast-charged generally shows faster battery aging than a same-age vehicle charged predominantly with AC (home-type) charging.
  4. Investigate the usage conditions. Aging can accelerate in vehicles used in hot climates or frequently charged to 100% and left that way for long periods. The thermal management system and the vehicle's usage history are important in this respect.

Does the Manufacturer Warranty Cover the Battery?

Most manufacturers offer a separate battery warranty of around 8 years / 160,000 km, although it varies from model to model. This is a major source of reassurance in a used purchase: if the warranty is still valid, a possible capacity loss may remain the manufacturer's responsibility. You can query the warranty status at an authorized service center with the chassis number; this step is the only official source that takes precedence over the seller's word.

Which matters more, mileage or SoH? The petrol/diesel vehicle inspection logic no longer applies to electric vehicles: experts commonly agree that battery health has replaced engine checks in used EV purchases and that the measurement should be a standard step.

Range Check During the Test Drive

A test drive is the chance to match the figures on paper with the real world. Take the car over fully charged, use it under normal driving conditions, and watch how quickly the estimated range indicator depletes. While enjoying the instant torque, pay attention to one point: this high torque can accelerate front/rear tire wear, so also check the tire condition.

Note any range loss symptoms during driving and any oddities that may indicate cell imbalance; unexpected slowdown during charging or gauge inconsistencies should be examined in detail during the inspection.

Points to Check Besides the Battery

In an electric vehicle, everything is not just about the battery. During the inspection, have the following points checked as well:

  • 12V auxiliary battery: It powers the electronic systems independently of the high-voltage battery and can weaken over time.
  • Charging port and cover mechanism: Mechanical fatigue can occur with frequent use.
  • Tire wear: Due to instant torque, wear may be faster than in gasoline-powered vehicles.
  • Software update history: Check whether the vehicle regularly receives OTA (wireless) updates and whether it is on the latest version.
  • Underbody and chassis damage: Since the battery pack is integrated into the chassis, a body check is just as important as SoH in an electric vehicle inspection.

Depreciation and Battery Replacement Concerns

The biggest concern of used electric vehicle buyers in the market is the question "what condition is the battery life in?" The strongest tool to address this concern is a professional battery health test you will have performed before purchasing and confirmation of a valid manufacturer warranty. A measured SoH value also strengthens your hand in negotiation: when range loss is demonstrated with concrete data, price evaluation is done based on data, not emotions.

Reliable Purchase Checklist

In short, follow these steps before buying a used electric vehicle:

  • Have the SoH measured via the OBD port or the vehicle screen; have cell imbalance checked.
  • Ask about the charging history; pay attention to predominantly DC fast charging usage.
  • Confirm the battery warranty status with the authorized service using the chassis number.
  • During the test drive, compare the full-charge range with real-world use.
  • Check the 12V battery, charging port, tires, and software updates.
  • Have a professional inspection done for underbody and chassis damage.

Battery health is a measurable value, the warranty is queryable, and range is testable. For a buyer who completes these three, the opportunities offered by the used electric vehicle market far outweigh the concerns.

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