Where Our Numbers Come From — How ZeroVoltion Verifies Every Spec

The Method

Where our numbers come from

Every spec on this site traces back to one of two places: a certificate we can show you, or a bench test we ran ourselves. This page is the paper trail — how we verify, how we label, and what we do when we get one wrong.

The short answer

We buy the same scooter we sell and take it completely apart before publishing a word about it. Certifications are verified with the issuing bodies and listed with their certificate numbers. Factory figures are labeled rated; our own tests are labeled measured; anything in between says estimated — and when we round, we round against ourselves.

The method, in five commitments

01We buy what we sell — and take it apart

Before the S60 page existed, an S60 sat disassembled on our bench: battery out, motors open, frame welds inspected, every plate photographed. The specs we publish are the ones we matched against that physical unit — box, plate, battery, and motors all telling the same story. If a product ever reaches this store without that teardown, it won't have spec claims — it'll say so.

02Certifications are verified, not copied from a listing

Certificates get checked against the issuing body and matched to the exact model — not the brand, the model. The S60 (KS-N12T3) stack:

Certification What it covers Reference
UL 2272 Electrical & fire safety of the whole system TÜV Rheinland · CU 72605906 0008
UN 38.3 Lithium battery transport testing tested · model-specific
FCC Part 15B Electronic emissions (Class B) tested / SDoC
RoHS · CE Hazardous-substance & EU conformity compliant

Wording matters: we say "UL 2272 certified" and "UN 38.3 tested" — and never stretch a certification to cover something it doesn't.

03Two kinds of numbers, always labeled

Rated — the factory's figure
Published as-is and labeled as the manufacturer's number: motor wattage (1,000W × 2 rated), top speed (≤31 mph), max load (264 lb), battery capacity (923.52 Wh — matched to the pack label on our bench).
Measured — our own testing
Speed, braking distance, hill climb, and real-world range at stated rider weights — coming with our ride-test program, published with the full test conditions. Until a number is measured, it stays labeled estimated.

And one house rule on top: ranges lead with the low end, costs round up, performance rounds down. If our number surprises you, it should surprise you in the right direction.

04What we won't publish

  • Peak-watt headlines. Peak is a sprint the motor holds for seconds. We lead with rated power — the all-day number.
  • Brochure range. Walking-pace lab figures don't survive real streets. Our range math assumes how people actually ride.
  • Specs we haven't seen paper for. Example, live right now: the factory lists the S60's frame as 6061 aluminum. That's what the paperwork says — and we're confirming it in writing before we print it as fact. Until then, it's labeled a claim.
  • Cherry-picked comparisons. When we compare, the same math runs on our product too.

05When we get one wrong

A correction gets made on the page where the error lived, dated, with the old figure struck through — not quietly swapped. If a verified answer ever contradicts something we published, the update says so plainly. The record is the point.

Common questions

Where do your range numbers come from?
From arithmetic you can check: battery watt-hours divided by a real-world burn rate of 25–35 Wh per mile — not from brochure tests. Our S60 example: 923.52 Wh ÷ 35 ≈ 26 miles as the planning number, until measured ride tests replace it. Run your own commute through the same math → the Range Calculator
Do you test the scooters yourselves?
Yes — bench testing first (full teardown, spec verification, cert matching), ride testing next: speed, braking, hills, and range at stated rider weights, published with conditions. Rated specs carry the factory label until then. See what the teardown covers → the S60, opened up
What's the difference between rated and measured?
Rated is the manufacturer's figure; measured is ours, from testing under stated conditions. Both appear on this site and both are always labeled — the label is the promise. How to read any spec sheet with this lens → the spec-sheet guide
Why should I trust a store's own numbers?
You shouldn't have to — that's why the method is public. Certificate numbers are listed so you can verify them independently, the math is shown so you can re-run it, and mistakes get corrected in the open. Check the claims against the paper any time → the S60 spec page

Keep going: see the method applied on the S60's spec page · learn the four numbers that matter on any listing in the spec-sheet guide · or take care of the machine you already own in Care & Upkeep.

METHOD · CURRENT AS OF JULY 2026ZEROVOLTION — NO DRAMA. NO COMPROMISE.