EV depreciation: the five causes and how to avoid them when buying

Why EV depreciation follows its own rules

That cars lose value, and roughly how the curve behaves, is not an electric-car topic — it applies to every vehicle and is described in the guide on the depreciation table with benchmark figures and a curve. Which general characteristics make a model hold its value is likewise covered by a dedicated guide. This article starts from a narrower question: why does depreciation on an electric car behave differently, often more steeply and above all more unpredictably than on a combustion car?

The short answer is that with an electric car, factors come together that a combustion car doesn't have. A diesel or petrol car ages along well-established patterns: wear, mileage, demand, model cycle. With an electric car these known mechanisms are overlaid by a component that accounts for half the vehicle's value and whose condition no one can see from the outside — and by a market still in motion technologically and politically. That makes the residual-value forecast more uncertain.

For you as a buyer this means two things. First, a low price on a used electric car is not a reliable signal — it can be a genuine bargain or mask a weak battery, and both look the same in the listing. Second, the focus of the inspection shifts: on a combustion car, rust, the fault memory and prior damage determine the value; on an electric car, battery health joins them as the single most expensive factor. The following sections take the five drivers apart one by one, so that with the next offer you can gauge what you are dealing with.

The battery: the most expensive value factor you can't see

By far the most important reason electric cars lose value differently is the drive battery. It is the single most expensive component of the vehicle, and its condition determines the residual value more than any individual combustion-car component. The catch: this condition appears on no document and cannot be read off either the model year or the mileage.

The decisive measure is the State of Health, SoH for short — the remaining capacity of the battery compared to its as-new state. A battery slowly loses capacity over the years and over the charge cycles; this is called degradation. How fast this happens, however, doesn't depend linearly on age or mileage but on treatment: frequent fast charging, constantly charging to a hundred percent, frequent deep discharging, plus heat and cold, all stress the cells to different degrees. Two equally old electric cars with identical mileage can therefore have a markedly different SoH — one charged gently on a wallbox, the other constantly at a fast charger under full load. That is exactly what makes age and mileage unreliable value indicators on an electric car.

The second lever is the price of a possible battery replacement. If capacity falls so far that range and everyday usability suffer, or if a cell defect occurs, a replacement is on the cards that can eat up a considerable part of the vehicle's value — on an older electric car, quickly more than the car is worth afterwards. This possibility hangs like a shadow over every used electric car and pushes the price down, because the buyer prices in the risk. An important counterweight is the manufacturer's battery guarantee: many manufacturers guarantee the battery over a certain period and mileage and often assure a minimum SoH along the way. Whether a used electric car is still within this guarantee and for how long is a tangible value factor — once it expires soon, the risk moves entirely to the buyer.

For the purchase, the single most important rule follows from this: the battery condition should be measured, not estimated. An SoH value from a read-out on the vehicle or a battery certificate turns the biggest unknown into a solid figure. Whoever buys a used electric car without this information is buying the most expensive part of the car blind.

Falling new-car prices and short model cycles

The second driver acts on the used market from above: new-car prices for electric cars are moving strongly, and they tend downwards. If the new-car price of a model or its successor falls, the gap a used example can hold to a new car automatically shrinks — the used value is pushed down from above. On a combustion car, new-car prices are comparatively stable over years; on an electric car, a single price round by the manufacturer can lower the value of every example already sold overnight.

On top of this comes the pace of technical development. Electric cars run through short innovation cycles: each new generation brings noticeably more range, shorter charging times or higher charging power. What counted as far only a few years ago quickly looks tight next to a current model. These visible advances devalue the previous generation disproportionately, because the market prices in the leap immediately — an effect that combustion cars don't have with this severity, where a new model generation rarely calls the basic usability of the old one into question.

In practice, for a used purchase, this means both opportunity and risk. The opportunity is that the steep initial depreciation on electric cars can favour the second buyer — the first owner has borne most of it. The risk is that you catch a model on the verge of a generation leap, or whose new-car price is currently falling; then your used car keeps losing value with it. A look at where an electric-car model sits in its life cycle, and whether a successor with markedly better figures has been announced, therefore belongs to the purchase research.

Subsidies, tax and technology in flux

The third and fourth drivers concern the environment in which an electric car holds or loses its value — an environment that changes faster than for a combustion car. Together, both make the residual-value forecast additionally uncertain.

State subsidies and the tax treatment of electric cars are not a fixed framework but politically mobile. Purchase premiums, tax advantages and company-car concessions have shaped the electric-car market — and every change to these rules shifts supply and demand and thus prices, including for vehicles already on the road. If a subsidy for new cars expires, it can initially make used electric cars more attractive; if tax advantages change, the effect works the other way. What matters is not the direction of a single measure, but that these framework conditions move at all and thereby carry an uncertainty into the residual value that the combustion market simply doesn't have. For you this means: when buying, don't rely on a subsidy advantage that may no longer exist at the later sale.

In parallel, the technology itself grows obsolete — at points that directly hit everyday value. The charging standard is one such point: an electric car whose connector, maximum charging power or compatibility with the current fast-charging network is no longer up to date becomes more cumbersome in everyday use and therefore less in demand. The software counts too: modern electric cars thrive on assistance and battery-management functions that are maintained via updates. If the update supply for an older model ends, or functions lag behind newer vehicles, this acts like technical ageing and pushes the value down. This form of obsolescence is a side issue on a combustion car, but a noticeable price factor on an electric car — an electric car is closer to a piece of consumer electronics whose standards keep moving on.

Purchased or rented battery — a decisive difference

A special case that completely changes the value and the arithmetic on a used electric car is the battery-rental model. On some older electric cars the drive battery does not belong to the vehicle but is rented separately — the buyer acquires the car but pays an ongoing monthly rental for the battery to the manufacturer. This is a fundamentally different construct from the model common today, where the battery belongs firmly to the purchased vehicle.

The difference is considerable for the value and for you as a buyer. An electric car with a rented battery has a markedly lower purchase price because the most expensive component isn't bought along with it — so the cheap listing price suggests a value that doesn't actually exist. In return you carry an ongoing monthly obligation that belongs in the total-cost calculation and that you have to pass on to the next owner when you resell. One advantage of the rental model is that the degradation risk usually sits with the lessor: if capacity falls too far, the battery is replaced under the contract — the SoH scare of the purchase model partly falls away.

With the purchased battery model, by contrast, the component belongs to you entirely, along with its risk and its residual value. Here the measured SoH and the remaining manufacturer guarantee count fully towards the vehicle's value. Before every purchase you therefore absolutely must clarify which model applies — purchased or rented battery — because otherwise neither the price nor the follow-up costs can be compared seriously. Two outwardly identical electric cars with a very different price can sometimes be explained by this difference alone.

How to avoid the value trap on a used electric car

From the five drivers a clear inspection order emerges that protects you from the most expensive mistake: buying a used electric car whose battery is weaker than the price and appearance suggest. The principle is to clarify the biggest unknown first and turn it into a solid figure.

First comes the battery condition. Ask for an SoH value — from a battery certificate provided by the seller or, more reliably, from your own measurement on the vehicle. A seller's certificate is a good start, but an independent read-out is more meaningful because it isn't coloured by the intent to sell. Second, clarify the battery guarantee: is the manufacturer's guarantee on the battery still running, over what period and mileage, and does it assure a minimum SoH? A still-running guarantee is a genuine, nameable value driver and takes a large part of the risk off you. Third, the charging history helps to place the measured SoH: a vehicle charged mostly gently on a wallbox ages the battery more slowly than a permanent guest at fast chargers — even though this can never be documented seamlessly, asking about it is a sensible building block.

Added to this are the points that also determine value on a combustion car and apply just as much on an electric car: clarify whether the battery is purchased or rented, check where the model sits in its life cycle and whether a successor pushes the value down further, and don't factor into the price a subsidy advantage that may have vanished by the resale. How to determine a vehicle's general market value and negotiating basis beyond that is set out by the guide in the Value and Price cluster — this article deliberately focuses on what is electric-car specific.

The sore point in all of this: the decisive value — the State of Health — you cannot reliably determine yourself as a layperson, and the listing details come from the seller. This is exactly the gap the independent on-site check from checkdenwagen closes. A neutral inspector comes straight to the vehicle — wherever it is — and checks over 100 points: on electric cars the drive battery's State of Health, plus the fault memory, paint-thickness all around and the underbody. You get the report with all findings within 24 hours; the on-site appointment takes approx. 1.5 hours. The Standard Check costs from €289 incl. VAT and travel. The Premium Check from €339 incl. VAT and travel additionally delivers a repair-cost calculation for the documented defects — so that with the electric car's most expensive component you don't have to guess, but have a figure in hand.