Battery assessment

Is this used EV worth it? Check if the battery is degraded

The battery is up to 40% of a used EV's value. Assess real health before you buy, sell, or negotiate — for just $4.99, in 1 minute, no subscription.

Launch promo: current prices are 50% off. One-time payment, no subscription.

Basic ·$9.98$4.99Premium with price & riskCalibrated for 50+ EV variants
Start assessmentSee what’s included
Secure Stripe checkoutNo subscriptionResult in ~1 min

Step 1

Enter your vehicle details

Choose a plan and complete the form. On the right you see the report format — your result appears in the same place.

Launch promo: current prices are 50% off. One-time payment, no subscription.

Basic assessment

$9.98$4.9950% off

Estimated health (SOH), battery grade, and real-world range for just $4.99. Resale risk and safe-purchase score are in the full report.

Vehicle

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Sample report format

Sample report

Illustration with fictional data so you know what to expect. Fill out the form to assess your vehicle.

Example:

Tesla Model 3 Standard Range Plus · 2020 · 42,005 mi

SuperCarros24

Report no.

SC24-BAT-EXEMPLO

Issued on March 15, 2024

Battery Health Certificate

Tesla Model 3 Standard Range Plus · 2020 · 42,005 mi

Basic Assessment

1. Executive summary

Estimated SOH

~87%

Expected range

82%92%

Probabilistic estimate — actual SOH may fall anywhere within this range.

Battery grade

B

Good

Estimated usable capacity (today)
43.5 kWh
Usable capacity (when new)
50 kWh
Gross / nominal capacity
54 kWh
Estimated range
217 mi
Confidence
Medium

2. Technical data

New range (EPA)
250 mi
Chemistry
NCA
Vehicle age
4 years
Equivalent cycles
255

Premium content

The full report includes resale value at risk, safe-purchase score, fleet comparison, and projection to 70% SOH.

Resale value at riskPremium Report
Safe purchase scorePremium Report
Fleet comparisonPremium Report
Years to 70% (warranty threshold)Premium Report

5. Recommendations

  1. Limit DC fast charging when possible — it accelerates degradation on NCA packs.

This assessment is an estimate based on empirical battery degradation models. It does not replace an official BMS/OBD reading or dealer diagnostic.

The battery can be worth thousands of dollars

A few percentage points of degradation can mean hundreds to thousands of dollars less in car value.

Many used EVs exceed expected wear

Fast charging, heat, and miles accelerate degradation — not always visible at first glance.

Not all manufacturer data is reliable

SOH reported by the car can be optimistic. We cross multiple signals for an independent estimate.

How it works

Three steps. No install, OBD optional.

1

Enter your car

Make, model, year, and miles. Takes less than a minute.

2

Instant calculation

Our model-calibrated engine estimates SOH from real degradation data.

3

Report & decision

See the grade, real range, and — with premium — resale impact.

What's included

Start with basic. Upgrade to premium if you need value and risk.

Basic
$9.98$4.9950% off
  • Estimated state of health (SOH)
  • Estimated real-world range
  • Battery grade (A–E)
  • Personalized recommendations
  • Report saved with lifetime access
  • Safe-purchase score—
  • Resale value at risk ($)—
  • Comparison with same model & age vehicles—
  • Degradation forecast & years to 70% (warranty)—
  • Calibration with your OBD/BMS reading—
  • Certificate to buy/sell with confidence—
Start with basic
Premium
$29.98$14.9950% off
  • Estimated state of health (SOH)
  • Estimated real-world range
  • Battery grade (A–E)
  • Personalized recommendations
  • Report saved with lifetime access
  • Safe-purchase score
  • Resale value at risk ($)
  • Comparison with same model & age vehicles
  • Degradation forecast & years to 70% (warranty)
  • Calibration with your OBD/BMS reading
  • Certificate to buy/sell with confidence
Get the full report

How we calculate (and why you can trust it)

We do not rely only on manufacturer-reported SOH — which can be optimistic. We use a hybrid model combining multiple signals for an independent estimate.

  • Calendar and cycle degradation, calibrated per model
  • Climate factor by US state (heat accelerates degradation)
  • Charging habits, charge limit, and thermal exposure
  • Optional: your OBD/BMS reading and real range for maximum precision
  • Public fleet degradation data as market reference

Frequently asked questions

Am I being overcharged for this EV?

The full report shows resale value at risk and how the battery compares to same model and age vehicles. It's concrete data to negotiate price.

Is the calculation reliable? Is this just "AI"?

We use a hybrid empirical model calibrated per vehicle, with public fleet degradation data (calendar + cycles + stress) and optionally your OBD/BMS reading. We do not rely only on manufacturer SOH, which can be optimistic. It is a robust estimate, but not a replacement for an official diagnostic.

Can I use the report to buy or sell a car?

Yes. It is your battery health proof — the factor that most influences used EV value. Use it to negotiate a purchase or give buyers confidence when selling.

Do I need an account to run the assessment?

No. The basic assessment costs $4.99 and can be paid directly without creating an account first. After payment the report is saved and accessible anytime.

Is payment secure? Is it a subscription?

Payments ($4.99 basic, $14.99 premium) are processed by Stripe and we do not store card data. One-time payment per report — no monthly fees or renewals.

Check battery health now

Dealer, importer, or fleet/leasing company?

Reduce financial risk on every used EV and add a battery certificate to your listings. Talk to us about volume assessments.

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