When buying a used electric car, the battery is the most expensive component to assess. Mileage, model year and cosmetic condition do not tell the whole story. You also need evidence of the battery’s real health, charging behaviour and the condition of the car’s electronic systems.
What does battery SOH mean?
SOH (State of Health) estimates how much of the battery’s original usable capacity remains. If a battery was 60 kWh when new and now stores about 54 kWh, its SOH is roughly 90%. It is a useful indicator, but it should never be the only factor in a buying decision.
1. Ask for a full diagnostic report
An OBD scan with model-specific software can reveal SOH, cell or module voltage differences, temperature history and fault codes. A seller’s verbal estimate is not a substitute for a professional report.
2. Check cell-voltage balance
A large voltage difference between cells may indicate imbalance or a weak module. This deserves special attention on cars with high mileage, accident history or previous battery work.
3. Compare displayed and real-world range
The range shown at 100% is an estimate. Test the car in city and faster-road conditions, note the average energy consumption and compare the result with a healthy example of the same model.
4. Test DC fast charging
A controlled DC charging session helps confirm whether the car accepts an appropriate charging rate. Battery temperature and state of charge affect the result, so judge performance under suitable conditions rather than relying on one peak number.
5. Inspect the charging port and cables
Look for corrosion, damaged pins, signs of overheating and worn cables. Confirm that the connector standard is compatible with the charging stations you plan to use in Georgia.
6. Review service and accident history
Pay close attention to impacts underneath the vehicle because the battery pack is usually mounted in the floor. Flood damage, poor structural repair or replaced modules require a specialist inspection.
7. Check battery heating and cooling
Thermal management affects battery life and fast-charging performance. A diagnostic check should cover pumps, sensors, coolant condition and stored errors.
8. Verify warranty conditions
Battery warranty may depend on age, mileage, original sales market and service history. Use the VIN to confirm whether manufacturer or dealer coverage is valid in Georgia.
How should you interpret SOH?
- 90% or higher: generally a very good result.
- 80–89%: often healthy for a used EV, depending on age and your required range.
- 70–79%: assess price, real-world range and potential repair costs carefully.
- Below 70%: obtain a specialist opinion before committing.
These figures are general guidance. Battery chemistry, thermal management and vehicle use all affect ageing.
Final advice
A used electric car can be economical and reliable when the decision is based on data. Get a professional inspection, verify realistic range and compare the price only after understanding the battery’s condition. Explore E-motions services or contact us for advice.