Why is checking the battery key in an electric car?
The battery is the most expensive and critical component of an electric car. Its condition determines the real range, the resale price and the interest of the final buyer. Unlike an ICE car, where a starter battery is worth less than €100, in an electric car 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. That is why it is not enough to look at the technical data sheet: the actual condition must be verified.
Tools and reports to verify the condition
Although there are apps and specific scanners for some models, many dealers can start with more accessible data:
DGT or Carfax report: checks mileage, service history and whether the car was left stationary for long periods (bad for batteries).
The car’s own indicators: many EVs show the "State of Health" (SOH) or an estimate of range at full charge.
Real-world range test: charge to 100% and drive in mixed conditions down to 20%, then extrapolate.
Avoid relying only on the % of charge or the estimated km shown on the screen, as these may be distorted by the previous driving style.
What data to look at in reports or tests
Range at full charge: compare it with the manufacturer’s original figure. If a Nissan Leaf stated 200 km and only delivers 120, there is a clear loss.
Charge cycles: if available, more than 1,000 cycles indicate wear.
Official service inspections: some models include battery testing in maintenance.
Fast-charging history: frequent DC charging speeds up degradation.
Models with a 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 real-world range and good efficiency
With frequent issues:
Nissan Leaf (1st gen): no liquid cooling, batteries degraded quickly in warm areas
Renault Zoe (with battery rental): doubts about actual ownership, old batteries are not very competitive
Peugeot iOn / Citroën C-Zero: very old, limited residual range
How to explain real range to the end customer
The buyer of an electric car wants to know whether they can get to work and back without problems. Beyond the homologated km, the professional should convey:
The real range in mixed use (city + road)
How much that range can drop in winter or with the climate control on
How much it costs to recharge (at home, public, fast)
Use simple examples: "This model does around 160 real km. If you live 30 km from work, you can do the round trip without recharging."
Practical summary
Assessing the battery is essential before buying a used electric car. A car with a good appearance but a degraded battery may be unsellable or generate many claims.
If in doubt, ask for a technical report or range test before closing the purchase. Want to avoid surprises and manage your stock more clearly? With Dealcar you can centralise the control and margin of each unit, whether ICE or electric.
Why is checking the battery key in an electric car?
The battery is the most expensive and critical component of an electric car. Its condition determines the real range, the resale price and the interest of the final buyer. Unlike an ICE car, where a starter battery is worth less than €100, in an electric car 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. That is why it is not enough to look at the technical data sheet: the actual condition must be verified.
Tools and reports to verify the condition
Although there are apps and specific scanners for some models, many dealers can start with more accessible data:
DGT or Carfax report: checks mileage, service history and whether the car was left stationary for long periods (bad for batteries).
The car’s own indicators: many EVs show the "State of Health" (SOH) or an estimate of range at full charge.
Real-world range test: charge to 100% and drive in mixed conditions down to 20%, then extrapolate.
Avoid relying only on the % of charge or the estimated km shown on the screen, as these may be distorted by the previous driving style.
What data to look at in reports or tests
Range at full charge: compare it with the manufacturer’s original figure. If a Nissan Leaf stated 200 km and only delivers 120, there is a clear loss.
Charge cycles: if available, more than 1,000 cycles indicate wear.
Official service inspections: some models include battery testing in maintenance.
Fast-charging history: frequent DC charging speeds up degradation.
Models with a 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 real-world range and good efficiency
With frequent issues:
Nissan Leaf (1st gen): no liquid cooling, batteries degraded quickly in warm areas
Renault Zoe (with battery rental): doubts about actual ownership, old batteries are not very competitive
Peugeot iOn / Citroën C-Zero: very old, limited residual range
How to explain real range to the end customer
The buyer of an electric car wants to know whether they can get to work and back without problems. Beyond the homologated km, the professional should convey:
The real range in mixed use (city + road)
How much that range can drop in winter or with the climate control on
How much it costs to recharge (at home, public, fast)
Use simple examples: "This model does around 160 real km. If you live 30 km from work, you can do the round trip without recharging."
Practical summary
Assessing the battery is essential before buying a used electric car. A car with a good appearance but a degraded battery may be unsellable or generate many claims.
If in doubt, ask for a technical report or range test before closing the purchase. Want to avoid surprises and manage your stock more clearly? With Dealcar you can centralise the control and margin of each unit, whether ICE or electric.
