VoltValue · Tesla
Verified by Tesla Fleet API

The certified
battery
passport
for your Tesla.

Buyers don't trust the dashboard reading. They trust an audited report. VoltValue turns your live Tesla telemetry into a finance-grade health certificate that earns you the resale price your battery actually deserves.

Generate my passportView a sample certificate →
180s
to certify
100%
read-only access
VERIFIED
VoltValue
Certified Battery Health Passport
Resale Passport
Certificate №
SAMP-LECE-RT00
Verified · BMS + Fleet API cross-check
Vehicle
2022 Model 3 Long Range AWD
VIN
XXXX XXXX XXXX 7G29
Color
Pearl White
Odometer
64,320 km
State of Health
94.7%
vs fleet avg 91.8%(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 12% of VoltValue fleet
Model 3 · 2022 · 60–80k km
vs 18 comparable cars
Warranty Expires
April 12, 2030
Manufacturer battery warranty period
Cycle Count
412
Degradation Rate
1.42% / yr
Warranty Expires
04/12/2030
Issued
May 9, 2026
Charging Habits
Based on 180 days of telemetry prior to issuance
Energy by source
Home (AC) · 82% · 2,840 kWhTesla Supercharger (DC) · 18% · 610 kWh
% of days the daily-average SoC fell in each band
Low <20% · 8.3%Gold 20–80% · 78.9%High >80% · 12.8%
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
The Process

Three steps to a verified resale.

01
Connect securely

OAuth 2.0 with Tesla Fleet API. Read-only — we can't unlock, honk, or move your car.

02
We audit silently

Up to 180 days of past charging behavior, cycle counts, and SOH samples — pulled from your car on day one and benchmarked against similar vehicles (same model, year, and mileage band) in the VoltValue network.

03
Share your passport

A single-page PDF + QR-verifiable public link. Drop it in your listing. Watch the offers rise.

The Payoff

What a certified passport gets you.

Fair resale price
Buyers pay full value when battery health is certified by a neutral third party — no more reflex discounts for missing proof.
Less haggling
Numbers are cross-checked against the Tesla Fleet API. Buyers stop questioning the figure and start negotiating in good faith.
Full transparency
SoH, cycle count, and up to 180 days of past charging behavior — read from your car the moment you connect, the kind of detail a screenshot from an app can never prove.
Starting early pays off
Every day you're connected, we collect one more reading. A Passport issued after 180 days of history is far more defensible than one issued after 3 days. Connect now — the dashboard is free until the moment you decide to sell.

See methodology →

Why a passport matters

The gap between trade-in and private sale is the dealer's margin.

Dealer trade-in
Conservative pricing

Dealers underbid because they absorb the battery risk for the next buyer — no proof means a built-in safety discount.

Private sale + VoltValue
True market price

A verified passport removes the buyer's risk — so you can list at fair market value, not a margin-padded discount.

The lost spread
Money that belongs to you

The gap between trade-in and private sale is the dealer's margin. With a passport, that money stays in your pocket.

Sample Output

A document buyers take seriously.

Designed like a financial instrument, not a marketing brochure. Print it. Email it. Embed it.

VERIFIED
VoltValue
Certified Battery Health Passport
Resale Passport
Certificate №
SAMP-LECE-RT00
Verified · BMS + Fleet API cross-check
Vehicle
2022 Model 3 Long Range AWD
VIN
XXXX XXXX XXXX 7G29
Color
Pearl White
Odometer
64,320 km
State of Health
94.7%
vs fleet avg 91.8%(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 12% of VoltValue fleet
Model 3 · 2022 · 60–80k km
vs 18 comparable cars
Warranty Expires
April 12, 2030
Manufacturer battery warranty period
Cycle Count
412
Degradation Rate
1.42% / yr
Warranty Expires
04/12/2030
Issued
May 9, 2026
Charging Habits
Based on 180 days of telemetry prior to issuance
Energy by source
Home (AC) · 82% · 2,840 kWhTesla Supercharger (DC) · 18% · 610 kWh
% of days the daily-average SoC fell in each band
Low <20% · 8.3%Gold 20–80% · 78.9%High >80% · 12.8%
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
FAQ

If I already have my own BMS data, do I still need VoltValue?

Fair question — knowing your own number and having a third party certify it are not the same thing. Here's what owners can't do alone:

Third-party credibility
A phone screenshot of your own diagnostics app is 'the owner said so' — the buyer can't tell if it was edited. A VoltValue certificate carries a QR + public verify URL the buyer scans to confirm authenticity, issuance date, and the original reading. Same difference as an OBD scanner you bought yourself vs a third-party vehicle history report.
Live cross-check against Tesla Fleet API
We pull a fresh range-based SoH directly from Tesla and compare it to your BMS value. Disagree by more than ±7 pts (NMC) or ±12 pts (LFP) and we refuse to issue. Owners can't do this alone — it requires Tesla partner credentials.
Fleet ranking
‘SoH 92.3%’ floats in space. ‘Top 15% of 2021 Model 3s with 60–80k km’ lands instantly. Requires a large dataset no individual owner has.
Up to 180 days of behavior history
We pull this history from Tesla the moment you connect — no 180-day waiting period. The patterns we keep: home vs Supercharger ratio, time above 90% SoC, idle-at-full-charge events. BMS can't show this, and none of it can be staged the night before a sale.
Translation into real resale value
‘92% SoH’ → buyer asks ‘so what?’ ‘+฿86,800 premium vs comparable Teslas’ → buyer reaches for the wallet.

Bottom line: BMS = your private OBD scanner. VoltValue = the third-party vehicle history + appraisal report buyers actually accept as proof.

Stop leaving money on the table.

A 3-minute audit. A lifetime of trust.

Get my certificate
Connect free → sell when ready