Table of Contents
Why electric vehicle valuation is different
Battery health: the data point that moves the price most
How to read the State of Health (SoH) of a battery
Real depreciation of used electric vehicles in Spain
How environmental labels affect 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 EV stock
Frequently asked questions
Why electric vehicle valuation is different
With an internal combustion engine (ICE) car, the year, mileage, and maintenance history are enough to approximate 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 vehicle, those three factors still matter but are not enough. The fourth factor, battery health, can swing the price by between €2,000 and €8,000 compared to the theoretical benchmark, depending on the model and how much capacity has been lost. Two identical cars in terms of year, mileage, and history can have completely different values if one retains 95% of its battery capacity and the other only 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 this figure, any valuation of an electric car has a margin of error that a dealership cannot afford to ignore.
Battery health: the data point that moves the price most
An electric car's battery degrades with use and time. This degradation is inevitable, but its rate varies depending on the model, the previous owner's charging habits, and the weather conditions in which the vehicle has operated.
A battery that is frequently charged to 100% and discharged to 0%, has spent summers in extreme heat, or has been charged mostly on high-power rapid 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 health levels.
The impact on price is direct. A model whose technical spec sheet states a range of 400 km when new 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 catalogue 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 commutes, or as a company car for predictable journeys.
How to read the State of Health (SoH) of a battery
SoH (State of Health) is the metric that measures the current capacity of the battery as a percentage of its original capacity. A 90% SoH means the battery retains 90% of its factory capacity.
The method to obtain this data depends on the make and model. Tesla is the easiest brand to access: the vehicle itself displays the current battery capacity in kWh on its screen in the service settings, allowing for a direct SoH calculation. For most other brands, reading the SoH requires connecting a specific OBD scanner for electric vehicles or accessing the manufacturer's official diagnostic platform through an authorised workshop.
There are third-party apps for 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 various models. Not all work with every model and reliability varies, but for a dealer working with EVs regularly, 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 with the model's WLTP range. The difference gives an approximation of the battery condition, though it is less accurate than a direct reading.
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 cars in Spain fell by 11.3% between 2024 and 2025, settling at around €29,900. Plug-in hybrids dropped even further, by 19.4%, down to €28,900.
See the full analysis of used car prices in 2025.
This drop has structural causes: the massive arrival of cheaper new models in the entry-level segment has pushed prices down across the entire used EV market, and expiring leasing stock is adding extra supply.
Depreciation is not uniform across all models. EVs with longer real-world range and a recognised brand hold their value better than models with limited range or brands with lower market penetration in Spain. A Tesla Model 3 or a Volkswagen ID.4 depreciates in a more predictable way and has higher demand in the used car market than a model from a brand with less presence or a smaller aftersales service network.
For the dealership, the implication is clear: there is not yet enough historical price data to predict with certainty how an EV will depreciate over the next 6 or 12 months. Buying with an extra 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 environmental labels affect the resale price
All pure electric vehicles (BEVs) and most plug-in hybrids (PHEVs) carry the ZERO label in Spain, the most favourable in terms of access to Low Emission Zones (ZBE) and discounts 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 in 2025, compared to €13,425 for vehicles with a B label. The label is not just a factor for accessing restricted areas: it represents a market price difference of more than €16,000 between the extremes.
For dealerships operating in urban areas or selling to buyers in cities with ZBEs, the environmental label must be one of the top stock purchasing criteria, right alongside year and mileage. An EV with an 85% SoH and a ZERO label can be a better asset than a diesel equivalent in year and mileage but without a label.
Read also how Euro 7 regulations and ZBEs affect stock value.
Models with the best and worst performance in the used car market
Based on price trends and demand in the Spanish market in 2024 and 2025, there are clear patterns regarding which models hold their value best and which struggle more.
The best performers are the Tesla Model 3 (high demand, good traceability of battery health, brand with strong identity), the Volkswagen ID.3 and ID.4 (wide service network, buyer familiarity, 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 workshop network).
Those facing the most difficulties are models with a range of under 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 time in Spain and a sparse network of workshops, and premium EVs over 5 years old with batteries clearly below 80% SoH.
Check the 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 health. The batteries in the early generations of the Leaf (2013-2017) without active thermal management have aged particularly fast in warm regions. Buying one without a battery diagnostic is taking on a real risk.
How to build a defensive purchase offer
With all this information, a purchase offer for a used electric car must be constructed differently from that of an ICE vehicle. The recommended steps are as follows.
First, obtain the battery SoH before making any offer. If this is not possible during the initial inspection, include a condition in the offer making its validity subject to a satisfactory battery diagnostic test.
Second, compare the model's current market price on active portals (not standard catalogue valuation tools, which may be outdated in the EV segment). The portals show the real price at which similar cars are being offered right now.
Check the used car valuation guide for dealerships.
Third, apply a discount on 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 off that benchmark.
Fourth, add the extra depreciation buffer mentioned earlier: between €500 and €1,000 extra due to market uncertainty in the EV segment at the present time.
Dealcar and managing EV stock
As used EVs gain presence in dealer inventories, tracking days in stock by model and battery type becomes more important. An EV with a low SoH that takes 90 days to sell because the buyer requests more diagnostics or extra warranties generates higher holding costs than usual.
Value any vehicle, calculate margins, and compare with real-time market data using Dealcar's valuation tool and market radar. More information at dealcar.io/tasacion.
Through Dealcar, you can record the SoH of each electric vehicle in the stock file, attach the battery diagnostic report, and make this info visible in the listing, which reduces friction with buyers and sets your dealership apart from those that don't offer such transparency. If you want to see how it works, request a demo at dealcar.io.
Frequently asked questions
At what mileage does an electric vehicle's battery start to degrade significantly?
It depends on the model and charging habits. Generally speaking, most modern electric cars maintain over 90% SoH up to 100,000-150,000 km with reasonable use. Beyond that figure, degradation speeds up slightly, but models like the Tesla Model 3 or Volkswagen ID.4 have shown very limited degradation even with over 200,000 km on some units. Older models without active battery thermal management (first-generation Nissan Leaf) can show significant degradation before reaching 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 dealership, a used EV with a heavily degraded battery needing replacement has no profitable solution in today's market. The valuation must reflect this condition, and the purchase price must be in line with the vehicle's actual 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 on most EVs is 8 years or 160,000 km, with a minimum SoH coverage (usually 70%). If the vehicle is still under warranty, this is a key selling point that should be featured in the advert.
How does charging history affect battery health?
Charging history is difficult to know with exact precision retrospectively, but there are indirect indicators. A vehicle that has been used mainly for short urban trips with overnight domestic charging (slow, at low power) usually has a better SoH than one that has been frequently charged at superchargers or high-power rapid chargers. High temperatures during charging also accelerate degradation. At the time of inspection, asking the seller about their usual charging habits provides useful, though non-verifiable, information.
Table of Contents
Why electric vehicle valuation is different
Battery health: the data point that moves the price most
How to read the State of Health (SoH) of a battery
Real depreciation of used electric vehicles in Spain
How environmental labels affect 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 EV stock
Frequently asked questions
Why electric vehicle valuation is different
With an internal combustion engine (ICE) car, the year, mileage, and maintenance history are enough to approximate 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 vehicle, those three factors still matter but are not enough. The fourth factor, battery health, can swing the price by between €2,000 and €8,000 compared to the theoretical benchmark, depending on the model and how much capacity has been lost. Two identical cars in terms of year, mileage, and history can have completely different values if one retains 95% of its battery capacity and the other only 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 this figure, any valuation of an electric car has a margin of error that a dealership cannot afford to ignore.
Battery health: the data point that moves the price most
An electric car's battery degrades with use and time. This degradation is inevitable, but its rate varies depending on the model, the previous owner's charging habits, and the weather conditions in which the vehicle has operated.
A battery that is frequently charged to 100% and discharged to 0%, has spent summers in extreme heat, or has been charged mostly on high-power rapid 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 health levels.
The impact on price is direct. A model whose technical spec sheet states a range of 400 km when new 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 catalogue 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 commutes, or as a company car for predictable journeys.
How to read the State of Health (SoH) of a battery
SoH (State of Health) is the metric that measures the current capacity of the battery as a percentage of its original capacity. A 90% SoH means the battery retains 90% of its factory capacity.
The method to obtain this data depends on the make and model. Tesla is the easiest brand to access: the vehicle itself displays the current battery capacity in kWh on its screen in the service settings, allowing for a direct SoH calculation. For most other brands, reading the SoH requires connecting a specific OBD scanner for electric vehicles or accessing the manufacturer's official diagnostic platform through an authorised workshop.
There are third-party apps for 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 various models. Not all work with every model and reliability varies, but for a dealer working with EVs regularly, 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 with the model's WLTP range. The difference gives an approximation of the battery condition, though it is less accurate than a direct reading.
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 cars in Spain fell by 11.3% between 2024 and 2025, settling at around €29,900. Plug-in hybrids dropped even further, by 19.4%, down to €28,900.
See the full analysis of used car prices in 2025.
This drop has structural causes: the massive arrival of cheaper new models in the entry-level segment has pushed prices down across the entire used EV market, and expiring leasing stock is adding extra supply.
Depreciation is not uniform across all models. EVs with longer real-world range and a recognised brand hold their value better than models with limited range or brands with lower market penetration in Spain. A Tesla Model 3 or a Volkswagen ID.4 depreciates in a more predictable way and has higher demand in the used car market than a model from a brand with less presence or a smaller aftersales service network.
For the dealership, the implication is clear: there is not yet enough historical price data to predict with certainty how an EV will depreciate over the next 6 or 12 months. Buying with an extra 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 environmental labels affect the resale price
All pure electric vehicles (BEVs) and most plug-in hybrids (PHEVs) carry the ZERO label in Spain, the most favourable in terms of access to Low Emission Zones (ZBE) and discounts 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 in 2025, compared to €13,425 for vehicles with a B label. The label is not just a factor for accessing restricted areas: it represents a market price difference of more than €16,000 between the extremes.
For dealerships operating in urban areas or selling to buyers in cities with ZBEs, the environmental label must be one of the top stock purchasing criteria, right alongside year and mileage. An EV with an 85% SoH and a ZERO label can be a better asset than a diesel equivalent in year and mileage but without a label.
Read also how Euro 7 regulations and ZBEs affect stock value.
Models with the best and worst performance in the used car market
Based on price trends and demand in the Spanish market in 2024 and 2025, there are clear patterns regarding which models hold their value best and which struggle more.
The best performers are the Tesla Model 3 (high demand, good traceability of battery health, brand with strong identity), the Volkswagen ID.3 and ID.4 (wide service network, buyer familiarity, 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 workshop network).
Those facing the most difficulties are models with a range of under 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 time in Spain and a sparse network of workshops, and premium EVs over 5 years old with batteries clearly below 80% SoH.
Check the 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 health. The batteries in the early generations of the Leaf (2013-2017) without active thermal management have aged particularly fast in warm regions. Buying one without a battery diagnostic is taking on a real risk.
How to build a defensive purchase offer
With all this information, a purchase offer for a used electric car must be constructed differently from that of an ICE vehicle. The recommended steps are as follows.
First, obtain the battery SoH before making any offer. If this is not possible during the initial inspection, include a condition in the offer making its validity subject to a satisfactory battery diagnostic test.
Second, compare the model's current market price on active portals (not standard catalogue valuation tools, which may be outdated in the EV segment). The portals show the real price at which similar cars are being offered right now.
Check the used car valuation guide for dealerships.
Third, apply a discount on 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 off that benchmark.
Fourth, add the extra depreciation buffer mentioned earlier: between €500 and €1,000 extra due to market uncertainty in the EV segment at the present time.
Dealcar and managing EV stock
As used EVs gain presence in dealer inventories, tracking days in stock by model and battery type becomes more important. An EV with a low SoH that takes 90 days to sell because the buyer requests more diagnostics or extra warranties generates higher holding costs than usual.
Value any vehicle, calculate margins, and compare with real-time market data using Dealcar's valuation tool and market radar. More information at dealcar.io/tasacion.
Through Dealcar, you can record the SoH of each electric vehicle in the stock file, attach the battery diagnostic report, and make this info visible in the listing, which reduces friction with buyers and sets your dealership apart from those that don't offer such transparency. If you want to see how it works, request a demo at dealcar.io.
Frequently asked questions
At what mileage does an electric vehicle's battery start to degrade significantly?
It depends on the model and charging habits. Generally speaking, most modern electric cars maintain over 90% SoH up to 100,000-150,000 km with reasonable use. Beyond that figure, degradation speeds up slightly, but models like the Tesla Model 3 or Volkswagen ID.4 have shown very limited degradation even with over 200,000 km on some units. Older models without active battery thermal management (first-generation Nissan Leaf) can show significant degradation before reaching 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 dealership, a used EV with a heavily degraded battery needing replacement has no profitable solution in today's market. The valuation must reflect this condition, and the purchase price must be in line with the vehicle's actual 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 on most EVs is 8 years or 160,000 km, with a minimum SoH coverage (usually 70%). If the vehicle is still under warranty, this is a key selling point that should be featured in the advert.
How does charging history affect battery health?
Charging history is difficult to know with exact precision retrospectively, but there are indirect indicators. A vehicle that has been used mainly for short urban trips with overnight domestic charging (slow, at low power) usually has a better SoH than one that has been frequently charged at superchargers or high-power rapid chargers. High temperatures during charging also accelerate degradation. At the time of inspection, asking the seller about their usual charging habits provides useful, though non-verifiable, information.
