Know Your EV's True Value: Independent Battery Health Assessment

The high-voltage battery is the single most valuable and expensive component of any electric or plug-in hybrid vehicle. Eliminate the uncertainty in buying, selling, or owning an EV with our fast, reliable, and manufacturer-independent State of Health (SoH) assessment. Battery condition is never uniform; many factors—from climate to charging habits—can severely affect a battery's capacity and performance.

Battery certificate preview for a Volkswagen ID4 with 92.7% state of health, showing passed battery checks, benchmarking graph indicating average performance, and certification by Aviloo.Independent battery certificate for Volkswagen ID4 with 92.7% state of health, energy of 68.6 kWh out of 74 kWh, and mileage of 72,215 km, certified as good with no abnormalities detected.Dashboard-style report showing detailed electric vehicle battery data including energy levels, range estimates, sensor statuses, BMS values, usage rating, charging status, cell voltage diagrams, and execution protocol checklist.

What is a battery state of health assessment?

A Battery State of Health (SoH) assessment is a critical diagnostic process that evaluates the current performance and overall condition of a battery compared to its specifications when it was brand new.It provides a quantifiable "health report" for the battery, most commonly expressed as a percentage (%).

State of Health (SoH) is a measure of how much a battery has degraded over time and use.

  • ‍100% SoH: The battery is in its original, brand-new condition and the user requirements, meeting all manufacturer specifications.
  • 70%-80% SoH (Typical End-of-Life for EV): For applications like Electric Vehicles, this range is often considered the threshold where the battery's capacity or power output is no longer adequate for its primary use, indicating the need for replacement or repurposing (second life).
Graph showing battery capacity degradation over mileage/years with state of health declining from 100% to about 70% at warranty/end-of-life threshold, illustrated by a car and battery icon.

Why Get Tested? Certainty, Value, and Safety

An independent SoH certificate builds trust and provides assurance in a market often plagued by missrepresentation.

  • Maximize Resale Value: Vehicles with documented battery health achieve higher sales prices and sell faster, providing a clear financial advantage for sellers.
  • Gain True Objectivity: The test provides an independent, third-party SoH value, which is often more accurate than the estimated readings displayed by the car's own internal Battery Management System (BMS).
  • Identify Hidden Faults: The detailed report checks the functionality of the BMS, sensor accuracy, and individual cell voltages to rule out hidden defects and potential "Red Flags" that could lead to costly repairs.
  • Predict Real-World Range: The SoH value allows buyers and owners to accurately calculate the remaining storable energy (kWh) and set realistic expectations for the vehicle's driving range.

AVILOO Test Options: FLASH vs PREMIUM

AVILOO offers the broadest vehicle coverage available on the market. Our technology is currently able to test over 95% of all popular electric and plug-in hybrid vehicles (EVs and PHEVs).

Feature
AVILOO FLASH Test
AVILOO PREMIUM Test
Does the certificate come with Industry recognition?
CARA Approved®
TUV-Certified
How is the test conducted?
Approximately 3 minutes to complete in your stationary vehicle
Conducted over several days as you use your vehicle from 100% to 10 - 5% state of charge
How are the results achieved?
Statistical AI model using historical and real-time BMS data.
Measures the exact energy extracted (kWh) during a full discharge cycle (100% to 10%).
What are the test accuracies?
Very High ( + or - 3% accuracy).
Highest level of accuracy (+ or - 1% accuracy).
What does the Report contain?
  • Aviloo State of Health Score
  • Benchmark Guide
  • SOH calculation accuracy
  • BMS State of Health
  • Min, Max and Delta Cell Temperatures
  • Min, Max and Delta Cell Voltages
  • Pack Voltage
  • Average Current
  • Gross, Net and Usable Energy
  • Gross, Net and Usable Estimated Range
  • View of all cell voltages
  • Battery sensor checks
  • Aviloo State of Health Score
  • Benchmark Guide
  • SOH calculation accuracy
  • BMS State of Health
  • Min, Max and Delta Cell Temperatures
  • Min, Max and Delta Cell Voltages
  • Pack Voltage
  • Average Current
  • Gross, Net and Usable Energy
  • Gross, Net and Usable Estimated Range
  • View of all cell voltages
  • Battery sensor checks
  • Measures actual values throughout test
Do I get a report with the test?
Immediate AVILOO Report
Comprehensive AVILOO Report
Comes with preview certificate?
Yes, preview certificate supplied
Yes, preview certificate supplied
Are tests independent of manufacturers?
Yes
Yes
Can hire the device to complete the test?
No
Yes
Can I get an In Person test in Central Scotland?
Yes
Yes
Cost For Individuals.
(Business customers contact us)
In-Person Test - £89 (Including VAT)
In-Person Test - £129 (Including VAT)
‍
Device Hire. - £139(Incl Shipping & VAT)

How to Book Your Battery Assessment?

We offer flexible testing options designed to fit your location and convenience. We currently offer the Flash Test and Premium Test via two options: our specialised In-Person Engineer Service or Nationwide Device Hire

Option 1: In-Person Engineer Service
Our engineers provide a full, convenient service for customers within the marked area below (Central Scotland).

  • Service Area: This covers the Central Scotland region, including Glasgow, Edinburgh, Stirling, and Dunfermline.
  • How it Works: Our engineer will come directly to your home or workplace to complete the approximate 3-minute Flash Test in one visit.
  • Support: In person support where our engineer will complete the test and talk you through the report results and provide paper copies of the preview and report.
Map showing a location marked between Glasgow and Edinburgh with a circular radius highlighting the central Scotland area including Stirling and Dunfermline.

Option 2: Nationwide Device Hire
If you are located outside the service area marked above (England, rest of Scotland, or Wales), the Premium Test is available via postal hire.

  • Availability: Device hire is available for the Premium Test only.
  • How it Works: We post the AVILOO Box to you to complete the test on your schedule, charge your car to 100%, connect device, drive car as normal until test is complete(typically 5% to 10% charge remaining), disconnect once test is complete and return in the post within 7 days using the pre paid postage provided in the package you recieve.
  • Support: We provide remote support where needed throughout the entire process

Ready to Assess Your Battery? Book Your Test Now.

Contact Us