How to assess the actual state of the battery in used electric cars

Why is it key to check the battery in an electric vehicle?

The battery is the most expensive and critical component of an electric car. Its condition determines the real range, resale value, and the interest of the final buyer. Unlike a thermal car, where a starter battery costs less than €100, in an electric vehicle, a main battery can cost between €5,000 and €15,000.

Natural degradation reduces its capacity over time and with use. Two identical cars can have very different ranges depending on how they have been charged and used. Therefore, it is not enough to look at the technical specifications: you need to verify the actual condition.

Tools and reports to verify the condition

Although there are apps and specific scanners for some models, many dealerships can start with more accessible data:

• DGT or Carfax report: checks mileage, history of inspections, and whether the car has been stationary for long periods (bad for batteries).

• Indicators from the car itself: many EVs show the "State of Health" (SOH) or an estimate of the range with a full charge.

• Real range test: charge to 100% and drive in mixed conditions until 20%, then extrapolate.

Avoid relying solely on the % of charge or the estimated km on the screen, as these can be skewed by previous driving style.

What data to observe in reports or tests

• Range with a full charge: compare it with the manufacturer's original claim. If a Nissan Leaf claimed 200 km and only gives 120, there is a clear loss.

• Charge cycles: if available, more than 1,000 cycles indicate wear.

• Official service reviews: some models include battery tests in maintenance.

• Fast charge history: many DC recharges accelerate degradation.

Models with good and bad battery reputation

With good durability:

• Tesla Model 3 and Y: good thermal management and OTA updates

• BMW i3: small but very stable batteries

• Hyundai Kona EV / Kia e-Niro: high actual range and good efficiency

With frequent problems:

• Nissan Leaf (1st gen): without liquid cooling, batteries degraded rapidly in warm areas

• Renault Zoe (with battery on lease): doubts about true ownership, old batteries are not very competitive

• Peugeot iOn / Citroën C-Zero: very old, residual ranges

How to explain the real range to the final customer

The buyer of an electric car wants to know if they will get to work and back without issues. Beyond the homologated km, the professional should convey:

• The real range with mixed use (city + highway)

• How much that range can decrease in winter or with climate control

• How much it costs to charge (at home, public, fast)

Use simple examples: "This model achieves about 160 real km. If you live 30 km from work, you can make a round trip without recharging."

Practical summary

Evaluating the battery is essential before buying a used electric vehicle. A car with good appearance but a degraded battery can be unsellable or lead to many complaints.

If in doubt, request a technical report or range test before closing the purchase. Do you want to avoid surprises and manage your stock more clearly? With Dealcar, you can centralize control and margin of each unit, whether thermal or electric.