A used electric car can be excellent value, but the battery is its most expensive component. Its condition affects range, resale value and future costs, so check it carefully before you buy.
What battery health means
All batteries lose some capacity over time. Battery health, often called state of health (SoH), compares the battery's current usable capacity with its capacity when new. A car with 90% SoH holds about 90% of its original energy.
How to check it
- Ask for a battery health report from an authorised service centre.
- Check the car's own display or app; some models show battery health or estimated range at 100%.
- Do a range test: charge to a known level and compare the displayed range with what the model offered when new, allowing for weather and driving style.
- Use a diagnostic tool through a trusted mechanic, where the model supports it.
Warranty and service history
- Check how many years and kilometres remain on the battery warranty, and whether it transfers to a new owner.
- Ask for service records, software update history and any battery repairs.
- Check for recalls on the model.
Questions to ask the seller
- How was the car usually charged: mostly at home, or mostly fast charging?
- Was it often left at 100% or run down to near 0%?
- Was it used in very hot conditions or for heavy daily mileage, such as cab use?
- Has it ever been in a flood or accident?
Physical checks
- Look underneath for damage to the battery casing.
- Check the charging port, cable and charger for wear or burn marks.
- Test both AC and DC charging if possible.
Price it right
Factor battery health and remaining warranty into the price. A lower price may not be a bargain if the battery has lost significant capacity.
See also habits that protect your battery.