Table of Contents
Why electric car valuation is different
Battery health: the data point that moves the price most
How to read the State of Health (SoH) of a battery
The real depreciation of used electric vehicles in Spain
How the environmental label affects the resale price
Models with the best and worst performance in the used car market
How to build a defensive purchase offer
Dealcar and managing electric car stock
Frequently Asked Questions
Why electric car valuation is different
With an internal combustion engine (ICE) car, the year, mileage, and maintenance history are enough to estimate the market value with reasonable accuracy. Standard valuation tools (Eurotax, Ganvam, portals) have enough transaction data to return a reliable range.
Read also how to detect clocked mileage before buying a car.
With an electric car, those three factors still matter but are not enough. The fourth factor, battery health, can alter the price by between €2,000 and €8,000 compared to the theoretical reference, depending on the model and how much capacity it has lost. Two cars identical in year, mileage, and history can have completely different values if one retains 95% of its battery capacity and the other has 78%.
The added problem is that battery health is not visible to the naked eye nor is it reflected in conventional valuation portals. A diagnostic test with a brand-specific tool is required, or failing that, a reading of the vehicle's own data. Without that data, any valuation of an electric vehicle has a margin of error that a dealer cannot afford to ignore.
Battery health: the data point that moves the price most
An electric car battery degrades over time and with use. This degradation is inevitable, but its rate varies depending on the model, the previous owner's charging habits, and the climate conditions in which the vehicle has operated.
A battery that is frequently charged to 100% and depleted to 0%, that has spent summers in areas of extreme heat, or that has been mostly charged at high-power fast chargers degrades faster than one managed with more care. This means that two cars of the same model and with the same mileage can have significantly different battery conditions.
The impact on price is direct. A model whose technical specifications declare a range of 400 km with a new battery, but at the time of valuation delivers 320 real km (80% SoH), has a practical range that many buyers will consider insufficient. A car with 380 real km of range is a different vehicle for the buyer, even if the catalog price was the same.
The rule of thumb is simple: below 80% SoH, the vehicle starts to struggle to sell at market price in segments where range matters. Below 70%, it is only viable for buyers with very urban and short usage, or as a company car for predictable commutes.
How to read the State of Health (SoH) of a battery
The SoH (State of Health) is the indicator that measures the current capacity of the battery as a percentage of its original capacity. An SoH of 90% means the battery retains 90% of its factory capacity.
The method to obtain this data depends on the make and model. Tesla is the brand with the easiest accessibility: the vehicle itself displays the current battery capacity in kWh in the service settings on its screen, allowing the SoH to be calculated directly. For most other brands, reading the SoH requires connecting an OBD scanner specific to electric vehicles or accessing the manufacturer's official diagnostic platform via an authorised workshop.
Third-party apps exist for some specific brands that allow reading the SoH without workshop tools: LeafSpy for the Nissan Leaf, CanZE for various Renault models, BimmerLink for electric BMWs, or Car Scanner with compatible OBD adapters for several models. Not all work with every model and reliability varies, but for a dealer working with electric cars on a regular basis, mastering the tools available for the most common models is a real competitive advantage.
If it is not possible to obtain the SoH directly, an indirect estimate involves checking the estimated range displayed by the vehicle when fully charged to 100% and comparing it to the model's WLTP range. The difference gives an approximation of the battery condition, although less precise than a direct reading.
The real depreciation of used electric vehicles in Spain
According to the used car price barometer from coches.com with 2025 data, the average price of second-hand electric vehicles in Spain fell by 11.3% between 2024 and 2025, settling around 29,900 euros. Plug-in hybrids fell even more, by 19.4%, down to 28,900 euros.
Check the full analysis of used car prices in 2025.
This drop has structural causes: the massive arrival of new, cheaper entry-level models has pushed prices down across the entire used EV market, and maturing leasing stock is adding extra supply.
Depreciation is not uniform across models. Electric vehicles with greater real range and recognized brands maintain their value better than models with limited range or brands with less penetration in the Spanish market. A Tesla Model 3 or a Volkswagen ID.4 depreciates more predictably and has more demand in the used car market than a model from a brand with less presence or a smaller aftersales service network.
For the dealer, the implication is clear: there is still not enough historical price data to predict with certainty how an EV will depreciate over the next 6 or 12 months. Buying with an additional buffer margin of between €500 and €1,000 compared to what is standard for combustion cars is the minimum reasonable hedge against this uncertainty.
How the environmental label affects the resale price
All pure electric vehicles (BEVs) and most plug-in hybrids (PHEVs) carry the ZERO label, the most favourable in terms of access to Low Emission Zones (ZBE) and tax benefits in some municipalities. Conventional hybrids get the ECO label. This distinction has a direct and growing impact on the resale price.
According to data from the same coches.com barometer, vehicles with the ZERO label sold for an average of 29,900 euros in 2025, compared to 13,425 euros for vehicles with a B label. The label is not just an access factor to restricted zones: it represents a market price differential of more than 16,000 euros between the two extremes.
For dealerships operating in urban areas or selling to buyers from cities with Low Emission Zones (ZBE), the environmental label must be one of the first stock-buying criteria, on the same level as year and mileage. An electric car with an 85% SoH and a ZERO label can be a better asset than a diesel car of equivalent year and mileage but without a label.
Read also how Euro 7 regulations and Low Emission Zones (ZBE) affect stock value.
Models with the best and worst performance in the used car market
Based on price and demand trends in the Spanish market for 2024 and 2025, there are clear patterns as to which models hold value best and which struggle more.
The best performers are the Tesla Model 3 (high demand, good battery health traceability, strong brand identity), the Volkswagen ID.3 and ID.4 (broad service network, buyer awareness, good battery performance), the Hyundai Ioniq 5 and Kia EV6 (recognised fast-charging technology, good real-world range, growing demand), and the Renault Zoe in the entry-level segment (the most affordable used EV on the market with an established garage network).
Those presenting the most difficulties are models with a range of less than 250 km in real-world conditions (such as the first-generation Nissan Leaf or older versions of the Renault Zoe with small batteries), models from Chinese brands with little presence in Spain and limited workshop networks, and premium electric cars over 5 years old with batteries clearly below 80% SoH.
Check opportunities and risks of second-hand Chinese cars.
A specific note on the Nissan Leaf: it is the used EV with the most units in circulation in Spain and also the one with the highest variability in battery condition. The batteries of the first-generation Leafs (2013-2017) without active thermal management have aged particularly fast in hot areas. Buying one without a battery diagnostic entails a very real risk.
How to build a defensive purchase offer
With all this information, the purchase offer for a used electric car must be built differently from that of an ICE car. The recommended steps are as follows.
First, obtain the battery SoH before making any offer. If this is not possible at the time of viewing, include a condition of validity in the offer subject to a satisfactory battery check.
Second, compare the current market price of the model on active portals (not catalog valuations, which may be outdated in the electric segment). Portals show the real price at which similar cars are being listed right now.
Check the used car valuation guide for dealerships.
Third, apply a discount to the market price proportional to the SoH. A rough guide: for every percentage point of SoH below 90%, deduct between €150 and €300 from the reference price, depending on the model and the overall price of the vehicle. An 80% SoH on a car with a €25,000 reference price justifies a discount of between €1,500 and €3,000 compared to that reference price.
Fourth, add the previously mentioned extra depreciation buffer: between €500 and €1,000 extra for market uncertainty in the electric segment at the current moment.
Dealcar and managing electric car stock
As used EVs gain presence in dealers' inventory, keeping track of days in stock by model and battery type becomes more important. An electric car with a low SoH that takes 90 days to sell because the buyer requests more diagnostics or guarantees generates higher-than-usual stocking costs.
With Dealcar, you can record the SoH of each electric vehicle in the stock profile, attach the battery diagnostics report, and display this information in the portal listing, which reduces friction with buyers and differentiates your dealership from those that do not offer this transparency. If you want to see how it works, request a demo at dealcar.io.
Frequently Asked Questions
At what mileage does an electric car's battery start to degrade significantly?
It depends on the model and charging habits. Generally speaking, most modern electric cars retain more than 90% SoH up to 100,000–150,000 km with reasonable use. Beyond that figure, degradation accelerates slightly, but models like the Tesla Model 3 or the Volkswagen ID.4 have shown very contained degradation even with more than 200,000 km on some units. Older models without active battery thermal management (first-generation Nissan Leaf) can show significant degradation before 80,000 km.
Is it possible to replace the battery of a used electric car?
Yes, but the cost is very high: between €8,000 and €20,000 depending on the model, which in most cases exceeds the value of the used vehicle. For a dealer, a used electric car with a highly degraded battery that needs replacing has no profitable solution in the current market. The valuation must reflect this condition, and the purchase price must be proportional to the vehicle's real utility value.
Does the manufacturer's battery warranty apply in the used car market?
Yes, as long as the vehicle is within the manufacturer's original warranty period, which for most EVs is 8 years or 160,000 km with a minimum SoH coverage (usually 70%). If the vehicle is still under warranty, this information is a key selling point that should be featured in the advert.
How does charging history affect battery health?
The charging history is difficult to know precisely after the fact, but there are indirect indicators. A vehicle that has been used mainly for short urban journeys with home overnight charging (slow, at low power) usually has better SoH than one that has frequently been charged at superchargers or high-power fast chargers. High temperatures during charging also accelerate degradation. At the time of inspection, asking the seller about their typical charging habits provides useful, though unverifiable, information.
Table of Contents
Why electric car valuation is different
Battery health: the data point that moves the price most
How to read the State of Health (SoH) of a battery
The real depreciation of used electric vehicles in Spain
How the environmental label affects the resale price
Models with the best and worst performance in the used car market
How to build a defensive purchase offer
Dealcar and managing electric car stock
Frequently Asked Questions
Why electric car valuation is different
With an internal combustion engine (ICE) car, the year, mileage, and maintenance history are enough to estimate the market value with reasonable accuracy. Standard valuation tools (Eurotax, Ganvam, portals) have enough transaction data to return a reliable range.
Read also how to detect clocked mileage before buying a car.
With an electric car, those three factors still matter but are not enough. The fourth factor, battery health, can alter the price by between €2,000 and €8,000 compared to the theoretical reference, depending on the model and how much capacity it has lost. Two cars identical in year, mileage, and history can have completely different values if one retains 95% of its battery capacity and the other has 78%.
The added problem is that battery health is not visible to the naked eye nor is it reflected in conventional valuation portals. A diagnostic test with a brand-specific tool is required, or failing that, a reading of the vehicle's own data. Without that data, any valuation of an electric vehicle has a margin of error that a dealer cannot afford to ignore.
Battery health: the data point that moves the price most
An electric car battery degrades over time and with use. This degradation is inevitable, but its rate varies depending on the model, the previous owner's charging habits, and the climate conditions in which the vehicle has operated.
A battery that is frequently charged to 100% and depleted to 0%, that has spent summers in areas of extreme heat, or that has been mostly charged at high-power fast chargers degrades faster than one managed with more care. This means that two cars of the same model and with the same mileage can have significantly different battery conditions.
The impact on price is direct. A model whose technical specifications declare a range of 400 km with a new battery, but at the time of valuation delivers 320 real km (80% SoH), has a practical range that many buyers will consider insufficient. A car with 380 real km of range is a different vehicle for the buyer, even if the catalog price was the same.
The rule of thumb is simple: below 80% SoH, the vehicle starts to struggle to sell at market price in segments where range matters. Below 70%, it is only viable for buyers with very urban and short usage, or as a company car for predictable commutes.
How to read the State of Health (SoH) of a battery
The SoH (State of Health) is the indicator that measures the current capacity of the battery as a percentage of its original capacity. An SoH of 90% means the battery retains 90% of its factory capacity.
The method to obtain this data depends on the make and model. Tesla is the brand with the easiest accessibility: the vehicle itself displays the current battery capacity in kWh in the service settings on its screen, allowing the SoH to be calculated directly. For most other brands, reading the SoH requires connecting an OBD scanner specific to electric vehicles or accessing the manufacturer's official diagnostic platform via an authorised workshop.
Third-party apps exist for some specific brands that allow reading the SoH without workshop tools: LeafSpy for the Nissan Leaf, CanZE for various Renault models, BimmerLink for electric BMWs, or Car Scanner with compatible OBD adapters for several models. Not all work with every model and reliability varies, but for a dealer working with electric cars on a regular basis, mastering the tools available for the most common models is a real competitive advantage.
If it is not possible to obtain the SoH directly, an indirect estimate involves checking the estimated range displayed by the vehicle when fully charged to 100% and comparing it to the model's WLTP range. The difference gives an approximation of the battery condition, although less precise than a direct reading.
The real depreciation of used electric vehicles in Spain
According to the used car price barometer from coches.com with 2025 data, the average price of second-hand electric vehicles in Spain fell by 11.3% between 2024 and 2025, settling around 29,900 euros. Plug-in hybrids fell even more, by 19.4%, down to 28,900 euros.
Check the full analysis of used car prices in 2025.
This drop has structural causes: the massive arrival of new, cheaper entry-level models has pushed prices down across the entire used EV market, and maturing leasing stock is adding extra supply.
Depreciation is not uniform across models. Electric vehicles with greater real range and recognized brands maintain their value better than models with limited range or brands with less penetration in the Spanish market. A Tesla Model 3 or a Volkswagen ID.4 depreciates more predictably and has more demand in the used car market than a model from a brand with less presence or a smaller aftersales service network.
For the dealer, the implication is clear: there is still not enough historical price data to predict with certainty how an EV will depreciate over the next 6 or 12 months. Buying with an additional buffer margin of between €500 and €1,000 compared to what is standard for combustion cars is the minimum reasonable hedge against this uncertainty.
How the environmental label affects the resale price
All pure electric vehicles (BEVs) and most plug-in hybrids (PHEVs) carry the ZERO label, the most favourable in terms of access to Low Emission Zones (ZBE) and tax benefits in some municipalities. Conventional hybrids get the ECO label. This distinction has a direct and growing impact on the resale price.
According to data from the same coches.com barometer, vehicles with the ZERO label sold for an average of 29,900 euros in 2025, compared to 13,425 euros for vehicles with a B label. The label is not just an access factor to restricted zones: it represents a market price differential of more than 16,000 euros between the two extremes.
For dealerships operating in urban areas or selling to buyers from cities with Low Emission Zones (ZBE), the environmental label must be one of the first stock-buying criteria, on the same level as year and mileage. An electric car with an 85% SoH and a ZERO label can be a better asset than a diesel car of equivalent year and mileage but without a label.
Read also how Euro 7 regulations and Low Emission Zones (ZBE) affect stock value.
Models with the best and worst performance in the used car market
Based on price and demand trends in the Spanish market for 2024 and 2025, there are clear patterns as to which models hold value best and which struggle more.
The best performers are the Tesla Model 3 (high demand, good battery health traceability, strong brand identity), the Volkswagen ID.3 and ID.4 (broad service network, buyer awareness, good battery performance), the Hyundai Ioniq 5 and Kia EV6 (recognised fast-charging technology, good real-world range, growing demand), and the Renault Zoe in the entry-level segment (the most affordable used EV on the market with an established garage network).
Those presenting the most difficulties are models with a range of less than 250 km in real-world conditions (such as the first-generation Nissan Leaf or older versions of the Renault Zoe with small batteries), models from Chinese brands with little presence in Spain and limited workshop networks, and premium electric cars over 5 years old with batteries clearly below 80% SoH.
Check opportunities and risks of second-hand Chinese cars.
A specific note on the Nissan Leaf: it is the used EV with the most units in circulation in Spain and also the one with the highest variability in battery condition. The batteries of the first-generation Leafs (2013-2017) without active thermal management have aged particularly fast in hot areas. Buying one without a battery diagnostic entails a very real risk.
How to build a defensive purchase offer
With all this information, the purchase offer for a used electric car must be built differently from that of an ICE car. The recommended steps are as follows.
First, obtain the battery SoH before making any offer. If this is not possible at the time of viewing, include a condition of validity in the offer subject to a satisfactory battery check.
Second, compare the current market price of the model on active portals (not catalog valuations, which may be outdated in the electric segment). Portals show the real price at which similar cars are being listed right now.
Check the used car valuation guide for dealerships.
Third, apply a discount to the market price proportional to the SoH. A rough guide: for every percentage point of SoH below 90%, deduct between €150 and €300 from the reference price, depending on the model and the overall price of the vehicle. An 80% SoH on a car with a €25,000 reference price justifies a discount of between €1,500 and €3,000 compared to that reference price.
Fourth, add the previously mentioned extra depreciation buffer: between €500 and €1,000 extra for market uncertainty in the electric segment at the current moment.
Dealcar and managing electric car stock
As used EVs gain presence in dealers' inventory, keeping track of days in stock by model and battery type becomes more important. An electric car with a low SoH that takes 90 days to sell because the buyer requests more diagnostics or guarantees generates higher-than-usual stocking costs.
With Dealcar, you can record the SoH of each electric vehicle in the stock profile, attach the battery diagnostics report, and display this information in the portal listing, which reduces friction with buyers and differentiates your dealership from those that do not offer this transparency. If you want to see how it works, request a demo at dealcar.io.
Frequently Asked Questions
At what mileage does an electric car's battery start to degrade significantly?
It depends on the model and charging habits. Generally speaking, most modern electric cars retain more than 90% SoH up to 100,000–150,000 km with reasonable use. Beyond that figure, degradation accelerates slightly, but models like the Tesla Model 3 or the Volkswagen ID.4 have shown very contained degradation even with more than 200,000 km on some units. Older models without active battery thermal management (first-generation Nissan Leaf) can show significant degradation before 80,000 km.
Is it possible to replace the battery of a used electric car?
Yes, but the cost is very high: between €8,000 and €20,000 depending on the model, which in most cases exceeds the value of the used vehicle. For a dealer, a used electric car with a highly degraded battery that needs replacing has no profitable solution in the current market. The valuation must reflect this condition, and the purchase price must be proportional to the vehicle's real utility value.
Does the manufacturer's battery warranty apply in the used car market?
Yes, as long as the vehicle is within the manufacturer's original warranty period, which for most EVs is 8 years or 160,000 km with a minimum SoH coverage (usually 70%). If the vehicle is still under warranty, this information is a key selling point that should be featured in the advert.
How does charging history affect battery health?
The charging history is difficult to know precisely after the fact, but there are indirect indicators. A vehicle that has been used mainly for short urban journeys with home overnight charging (slow, at low power) usually has better SoH than one that has frequently been charged at superchargers or high-power fast chargers. High temperatures during charging also accelerate degradation. At the time of inspection, asking the seller about their typical charging habits provides useful, though unverifiable, information.
