VoltValue
VoltValue
Audit-grade

Certified
EV Battery Passports

Bank-grade, QR-verifiable battery health reports that lift your EV resale price. Pick your brand to begin.

Live fleet data — updated daily
—
Fleet average SoH
across all monitored vehicles
How it works

Three steps from connect to Passport

01
Connect

Connect your Tesla account via the official Tesla Fleet API. Read-only access — we never control your car.

02
Analyze

We collect battery telemetry daily and compute your State of Health using a weighted median across up to 180 days of readings.

03
Share

Your Passport is issued with a certificate number and QR code. Share it with buyers, dealers, or finance companies.

Verified by Tesla Fleet API — official read-only access
QR-verifiable — anyone can confirm authenticity
Used by finance companies for loan evaluation
Your raw data never leaves Tesla — only the Passport is shared
Sample Passport

This is what buyers and dealers see.

VERIFIED
This is a sample passport for illustration only — not a real vehicle report.
SAMPLE
VoltValue
VoltValue
Certified Battery Health Passport
Resale Passport
Certificate №
SAMP-LECE-RTNE
Verified · BMS + Fleet API cross-check
Vehicle
2023 Long Range EV Dual Motor
VIN
XXXX XXXX XXXX 4A12
Color
Midnight
Odometer
52,180 km
Battery Type
Likely NMC · ~75 kWh usable
Derived from VIN and trim — actual chemistry may vary by production date. Confirm with Tesla Service for official specification.
State of Health
95.2%
vs fleet avg 92.6%(illustrative)
Method: nominal full-pack kWh from BMS (user-submitted) ÷ original new-pack kWh — cross-checked against live Fleet API range estimate within ±7 pts (NMC) / ±12 pts (LFP)
Fleet Ranking
Top 14% of VoltValue fleet
Long Range EV · 2023 · 40–60k km
vs 22 comparable cars
Warranty Expires
March 18, 2031
Manufacturer battery warranty period
Degradation Rate
1.15% / yr
Days of Data
180
days of battery history collected
Report Issued
May 9, 2026
Charging Habits
Based on 180 days of telemetry prior to issuance
Energy by source
Home (AC) · 83% · 2,680 kWhTesla Supercharger (DC) · 17% · 540 kWh
% of days the daily-average SoC fell in each band
Low <20% · 7.2%Gold 20–80% · 81.1%High >80% · 11.7%
This certificate represents a snapshot of the vehicle's battery condition at the time of issuance, derived from Tesla Fleet API telemetry. Validity expires August 7, 2026. Verify authenticity by scanning the QR.
QR
Scan to verify live status
Publicly verifiable
Every passport carries a public QR + verify URL that buyers can scan for 180 days.
Pulled from the car
Tesla Fleet API or Enode's OEM gateway — not an editable screenshot from an app.
180 seconds to certify
Connect, audit, issue — done in the time it takes to drink a coffee.
For Tesla owners
VoltValue · Tesla

Read-only Tesla Fleet API connection. Audit SOH, cycle count, and up to 180 days of past charging behavior.

Not selling yet?

Try it free for 30 days.

Connect your Tesla today and we start building your battery history from day one. By the time you're ready to sell — whether that's 6 months or 3 years from now — your Passport will be backed by months of real data, not just a single snapshot.

The first 30 days are free. After that, ฿299 keeps your battery monitored for 180 days — and lets you issue your Passport as many times as you like during that period.

Try free for 30 days
Compatible with

Works with Tesla Fleet API

Tesla logo

Connected via the official Tesla Fleet API — read-only access. VoltValue is not affiliated with Tesla, Inc.