Know the battery.
Know the car.
Understand battery condition, real-world range, charging costs and ownership costs before buying a used electric vehicle (EV).
Free tools. No sign-up. Your data stays with you.
Illustrative inputs, not a diagnostic result.
Start with what matters.
A closer look at the numbers behind your next EV.
Battery Health Estimator
Turn your range and consumption into an estimated usable-capacity band. See what the numbers can—and cannot—tell you.
Used EV Analyzer
Bring the battery, range, charging, warranty and running costs together before you speak to the seller.
Real-World Range
Plan your driving range around usable energy, realistic consumption and an arrival reserve.
Charging Cost
Calculate a full charge or a partial top-up, cost per mile or kilometre, and your monthly energy budget using your own electricity tariff.
What will charging really cost each month?
Compare your home/public mix, test a charging subscription and check home charger payback.
Compare charging tariffs →Different consumption units? Convert kWh/100 km, miles/kWh and Wh/mile.
Different cars. Different questions.
Battery options, charging context and checks for the viewing.
A range estimate is
only part of the story.
Two cars can show the same range and have different battery conditions. We help you separate evidence from assumptions—and see what still needs checking.
How we work with your dataManufacturer data
Original specifications, with their source and applicable variant.
Reported measurements
Your diagnostic SoH, shown separately and never presented as verified by us.
Calculations
The formulas and numbers behind energy, range and cost.
Estimates
Visible assumptions, sensitivity bands and evidence confidence.
A little knowledge goes a long way.
EV Battery Health Tests: Methods, Reports and Limitations
Compare BMS readings, onboard tests, diagnostic reports and capacity tests. Choose useful battery evidence before buying a used EV.
Read guideHow Much Does It Cost to Charge an Electric Car?
Work out the price of a top-up, cost per mile or kilometre, monthly home/public charging costs and when a subscription actually pays for itself.
Read guideHow Long Do Electric Car Batteries Last?
Separate battery lifespan, gradual capacity loss and warranty cover. Learn what the evidence can tell you about an older electric car.
Read guideMake sense of the Battery Passport.
Understand the identity, performance and sustainability fields—and the limits of what a digital record can tell you.
Electric car taxes changed. What does it mean for you?
Check the country and date, then compare annual tax, purchase tax, range and energy costs.
Trust starts with showing our working.
Our formulas, confidence labels, sources and limitations are open to inspection.