Check the battery before you buy — fast, independent, mileage-aware

Buying a used EV?
Check the battery first.

Enter the model, mileage and battery chemistry to estimate real motorway range, battery health and winter downside before you buy the wrong car.

✓ Battery SOH %
✓ Real highway range
✓ Battery degradation curve
✓ Fair price estimate
✓ Red flags checklist
✓ Winter worst-case
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Search by brand + model + year. Example: 2024 Audi Q6 e-tron.
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Physics engine V5.7
162 vehicles calibrated
MAE 5% accuracy
No manufacturer affiliation
$1.99 one-time — no subscription
Select a Vehicle
Search above and pick a car to start the audit
State of Health
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70%85%100%
🔋
Battery Audit Engine Ready
Search for a vehicle above, then adjust mileage to see how much range has degraded vs. new.
Range Impact
Degradation vs. New Car
−0 mi
Now: — When New: —
When New
—
Undegraded · 65 mph · 20°C
At This Mileage
—
Physics-calculated with SOH applied

Live Physics Diagnostics

Engine V5.7
Particle CFD · Potential Flow
Aerodynamic Wind Tunnel
Select a vehicle
Live
Drag Force
— N
Drag Power
— kW
Air Density ρ
1.225 kg/m³
Wake
Free
Fast
Turb.
Speed — drag ∝ v² 65 mph
Faster = longer, brighter trails. Roof particles turn amber then red as Bernoulli suction peaks. At 90 mph wake doubles in energy cost.
Temp — density ρ 20°C
Cold air is denser: ρ = 1.225 × 288/(T+273). More particles at low temps. Hull shifts blue below 5°C.
Drag Coeff. Cd
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Silhouette adapts live. Cd 0.21 sedan vs Cd 0.38 pickup — watch the wake size change.
Aero Power Draw
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P = F·v. Above 75 mph aero drag overtakes rolling resistance as the top energy consumer.
Range Δ vs 65 mph
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Speed penalty only. 55 mph = +18% range. 85 mph = −34%. Compounds hard above 75.
Curb Weight
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Rolling resistance = Crr × m × g. Below 40 mph weight dominates over aero drag.
Cold / HVAC Loss
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Dense cold air + heating load. Heat pump cuts heating cost ~40% vs resistive element.
Aero Efficiency
—
Wh/mile from drag only at current speed. Tesla Model S = ~38 Wh/mi at 65 mph.
Full Battery Report
Get the complete picture
Personalised to your speed, your climate, your charging habits. Ownership projection, red flags checklist, and fair price estimate.
SOH analysis Speed × temp matrix Winter range Degradation curve Fair price estimate Red flags
~97% Accuracy:
RealEVRange operates a proprietary V57 physics engine. We cross-reference raw kinetic data against independent highway testing to eliminate manufacturer bias.