Direct Questions for the Seller
Whether speaking with a private seller in suburban Lyon or a dealership in Frankfurt, don't settle for "it drives great and charges quickly." Put these specific questions on the table:
- "How has the car primarily been recharged?" A vehicle charged predominantly at home on a 7.4 kW or 11 kW wallbox has experienced far less thermal cycling than one reliant on daily 150 kW motorway hubs.
- "What was the typical daily charge limit set on the infotainment screen?" Did the previous owner set an 80% daily charge ceiling, or did they habitually leave it topped up to 100% every weekend?
- "Has the high-voltage pack or coolant loop undergone any recall service?" Ask for official paperwork verifying that battery thermal management software recalls were performed at authorized franchise centres.
- "Is the remainder of the original 8-year high-voltage warranty intact?" Confirm whether missing an annual cabin filter or brake fluid inspection at an independent garage might have breached manufacturer warranty conditions.
The Essential Test-Drive Routine
An EV test drive should evaluate energy management, not just road handling:
- Cold Start Inspection: Ask the seller in advance not to pre-warm the cabin or charge the car right before you arrive. Turn the vehicle on from cold and note initial range projections and HVAC draw.
- Highway Acceleration Burst: When entering an open motorway slip road safely, demand a steady burst of moderate-to-firm acceleration. Watch the battery percentage and power meter. A sudden jump downward in state-of-charge percentage indicates an imbalanced module dropping voltage under load.
- Regenerative Braking Behaviour: Switch between different regeneration modes (one-pedal driving, low regen, coasting). Deceleration should feel smooth and linear without shuddering or hesitation.
- Climate Control Thermal Load: Turn the heating to maximum and listen for unusual buzzing, rattling, or high-pitched groans from the heat pump or PTC heater. The thermal system is vital for battery health.
The Mandatory Charging Station Test
Never conclude an EV transaction without plugging the car into two different charging sources:
1. AC Level 2 Check (Type 2 Mennekes)
Plug into an AC charging station (public street pillar or dealership wallbox). Verify that the on-board charger (OBC) engages smoothly, locks the cable securely, and ramps to the expected rate (e.g., 7 kW or 11 kW) without tripping or showing red port warning LEDs.
2. DC Fast-Charging Check (CCS2)
Drive to a nearby high-power DC station (Ionity, Fastned, EnBW, etc.) with the pack below 60%. Plug in the heavy CCS2 connector. Verify that electronic handshake, insulation test, contactor click, and charging ramp initiate without protocol errors.
Comparing Two Used EVs: A Practical Example
Imagine you are deciding between two four-year-old hatchbacks at similar prices:
- Option A: 42,000 km, pristine exterior, but lived on rapid chargers in an apartment without home charging; SOH reads 84% with a 38 mV cell delta.
- Option B: 78,000 km, small stone chips on front bumper, full main-dealer service book, charged exclusively at home on 3.7 kW overnight; SOH reads 91% with a uniform 9 mV cell delta.
Despite having nearly double the odometer mileage, Option B possesses the superior electrochemical asset. In an electric vehicle, cell health and thermal history often trump superficial cosmetic mileage.