Buying a car commits you for several years. The displayed price represents only a fraction of the actual cost, and the type of engine chosen radically changes the maintenance bill. Choosing your next car well starts with asking the right questions before looking at ads.
Battery health: the criterion that no one checks on a used electric car
You may have noticed that on a thermal car ad, mileage is the first reflex to check? On a used electric car, this reflex is no longer enough.
The determining criterion is called SOH, or State of Health. It expresses as a percentage the remaining capacity of the battery compared to its new state. A battery with 80% SOH offers significantly less range than when delivered, and its resale value drops proportionally.
Before signing, ask the professional seller for a battery diagnostic report. Also check the remaining warranty on the battery pack, the presence of the original charging cables, and the history of software updates. A vehicle with SOH below 80% can hold unpleasant surprises on long trips.
The used electric car market has grown by 52% in the first eight months of 2026, reaching 162,000 transactions according to AAA DATA. This acceleration means that the supply is expanding, but also that aging vehicles are entering the market. Knowing how to read a battery diagnostic becomes a buyer’s skill.
To compare available electric and thermal models, you can visit the Mon Guide Auto website, which brings together detailed sheets by vehicle category.
Real cost of a car: going beyond the purchase price to compare engines
The catalog price or the price displayed in an ad says almost nothing about the real cost. Two cars at the same purchase price can generate considerable differences over five years.
Factors that widen the gap
- Car insurance varies greatly depending on the engine type, tax horsepower, and the driver’s profile. A plug-in hybrid SUV often costs more to insure than a gasoline city car.
- Regular maintenance (oil change, brake pads, timing belt) is almost non-existent on an electric car, while it represents a significant annual budget on a diesel.
- Energy consumption: the price of diesel, gasoline, or kilowatt-hour fluctuates. On a daily commute, electric vehicles are cheaper per kilometer than thermal ones in most urban and suburban cases.
- Depreciation at resale: some premium models lose a significant part of their value in three years, while popular city cars resell easily.
Before choosing, lay these four factors side by side over a realistic holding period. A model that is more expensive to buy may turn out to be more economical overall.
Assistance for purchasing a used electric vehicle: the CEE scheme from September 2026
Since September 1, 2026, a new aid scheme facilitates the purchase or leasing of a used electric car. This mechanism is based on Energy Savings Certificates (CEE).
Why does this scheme deserve your attention? Because it targets a specific segment. Only 100% electric vehicles purchased from a professional are eligible. The vehicle must have been registered in France between 2017 and 2023, have a SOH of at least 80%, and be kept for a minimum of 36 months by the buyer.
These conditions are strict, but they protect the buyer. The 80% SOH threshold ensures a still-performing battery. The retention obligation prevents speculation on public aid.
Check eligibility before negotiating
Ask the professional seller to confirm in writing the date of first registration and the battery diagnostic report. Without these documents, no aid can be granted. The decree of August 10, 2026, precisely outlines the conditions.
Car maintenance: three checks that prevent costly repairs
Regular maintenance is nothing spectacular, but it determines the vehicle’s longevity and resale value. Three points deserve special attention, regardless of the engine type.
Tires first. Incorrect pressure accelerates uneven tire wear and increases fuel consumption. Check the cold pressure at least once a month.
Brake fluid next. This fluid absorbs moisture over time, reducing braking efficiency. Replacement every two years is recommended by most manufacturers.
Filters finally. A clogged air filter decreases the performance of the thermal engine. The cabin filter, often neglected, degrades indoor air quality and can cause persistent odors.
On an electric car, regenerative braking puts less strain on the pads. Maintenance then focuses on air conditioning, tires, and software control of the battery pack.
Choosing between new and used: what the market really changes in 2026
The overall used car market is declining, but the used electric segment is progressing strongly. This reversal creates an interesting window for buyers.
An electric model three to five years old, with a SOH above 85%, still offers sufficient range for daily use. Its purchase price is significantly lower than that of a new one, and CEE aids help reduce the bill.
Conversely, a recent used thermal car retains the advantage on long trips without charging infrastructure. The choice depends on the daily distance traveled and access to a charging station at home or work.
The best approach remains to quantify both scenarios over the expected holding period, including energy costs, maintenance, and depreciation. The cheapest vehicle to buy is not always the one that costs the least over five years.
