Displayed range below 80%
Read SOH, cell voltage delta and fault codes before payment.
Used EV pre-purchase risk tool
Check the battery risk before you buy a used EV
Use information you can gather during a viewing to estimate displayed range retention, mileage intensity, charging and accident risks, then produce a practical inspection checklist.
1.6MUsed NEV transactions in 2025 reference
30 secFor a first-pass check
Local onlyNo vehicle data upload
Sample report
Medium risk 46/100
Range retention, mileage intensity and charging records need review.
Free local calculation
Enter viewing details and generate a risk report
All calculations run in your browser. Displayed range retention is a risk signal, not true SOH.
Risk guides
Turn battery risk into practical questions
Range loss, SOH, fast charging, pack impact, flood risk, warranty and commercial use all have evidence you can verify onsite.
Risk guide
How much displayed range loss is abnormal?
Displayed range is not SOH, but it is one of the easiest onsite risk signals. Below 80% needs BMS review; below 70% should not be bought on a test drive alone.
Risk guideHow to read SOH and cell voltage delta
SOH reflects capacity-health trend; cell voltage delta reflects consistency risk. One number is not enough: review temperature, SOC, fault codes and test-drive behavior.
Risk guideHow fast-charging history affects risk
Fast charging is not automatically bad, but high share, hot climate, cooling issues and high mileage together should raise the inspection level.
Popular checks
Start with high-demand models
Each model page focuses on battery, warranty, accident and inspection risks, not generic car reviews.
Tesla
Tesla Model Y
battery pack underside; accident repairs; fast-charging records
BEV · 2021-2026 TeslaTesla Model 3
battery pack impact; fast-charging records; accident repairs
BEV · 2019-2026 BYDBYD Han EV
battery pack underside; EV system warranty; body accident history
BEV · 2020-2026 BYDBYD Song Plus DM-i
engine and hybrid system; traction battery; fuel use with low battery
PHEV · 2021-2026 BYDBYD Song Plus EV
battery pack underside; displayed full-charge range; fast-charging records
BEV · 2021-2026 BYDBYD Yuan Plus
battery pack underside; slow and fast charge ports; tires and suspension
BEV · 2022-2026 BYDBYD Dolphin
high mileage; charging frequency; undercarriage scrapes
BEV · 2021-2026 BYDBYD Seagull
low-price listing risk; accident, stock or demo-car history; battery, warranty, undercarriage and service-record checks
BEV · 2023-2026Why this is not exact SOH
Online checks estimate risk; true SOH needs diagnostic data
Displayed range can shift with temperature, driving style, tires, HVAC, BMS calibration and range standard. This site uses it as a pre-purchase signal and tells you what to verify next.
Flood history
High-voltage and insulation risk rises sharply.
Commercial or high-mileage use
Review warranty and valuation under heavy-use assumptions.
City context
The same car needs different checks in different cities
Beijingwinter range loss; battery preheating; high-mileage commuting; warranty reviewShanghaihumidity; undercarriage corrosion; frequent commuting; charging recordsGuangzhouthermal management; fast-charge share; flood signs; commercial useShenzhenhot-weather fast charging; commercial use; battery pack underside; warranty limitsHangzhoubattery pack underside; charging records; battery, climate, charging and service-record riskChengducongestion energy use; battery, climate, charging and service-record risk; battery, climate, charging and service-record risk; family useChongqingbattery, climate, charging and service-record risk; battery, climate, charging and service-record risk; thermal management; battery, climate, charging and service-record riskWuhanthermal management; flood signs; battery, climate, charging and service-record riskXi'anbattery, climate, charging and service-record risk; battery preheating; battery, climate, charging and service-record riskNanjingundercarriage corrosion; flood signs; battery, climate, charging and service-record risk