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All certificationWedge one · Second-life certification

A portable health certificate, so packs can be bought and sold.

A used pack today is an unpriceable object. It moves between owners with no record, so the buyer prices the worst case and the seller eats the difference. Cellworth issues a certificate that travels with the pack.

Request a sample certificateSee the certificate
Who it's for

Three people who cannot do their job without this number.

Second-life integrators

Buying end-of-automotive-life packs for stationary storage, and currently grading them by hand or by hope.

Dismantlers and pack traders

Holding stock they cannot describe to a buyer beyond make, model and mileage.

OEM and fleet remarketing teams

Sitting on returned packs written down to salvage because nothing else is provable.

What they receive

What actually lands in your hands.

Certificate
A one-page PDF per pack: state of health, 95% interval, remaining-life curve, degradation-mode breakdown and methodology note.
Grade
A band — A1 through C — so a pallet of packs can be sorted and priced without reading forty documents.
Record
A verifiable reference tied to the pack serial, so the certificate can be checked by the next owner rather than taken on trust.
Bulk API
Certificates issued across a whole inventory from a telemetry export, not one pack at a time.

Specimen · CW-0417-A

Cellworth

Certificate of state of health

CertificateCW-0417-AIssued12 August 2026
Pack64 kWh NMC 622 pouch
SerialREF-2019-64NMC-0417
In serviceMarch 2020 · 540 EFC
State of health0.0%95% interval ± 1.8 pp
Remaining useful life0EFC95% interval 400 – 910 · ≈ 3 yr 10 mo at observed duty
100%95%90%85%80%END OF AUTOMOTIVE LIFETODAY03507001,0501,400
Method

Physics-informed degradation model fitted to charge-segment telemetry. No capacity test, no teardown.

Specimen document · fictional pack · not a valuation

Open the full A4 document

What it unlocks

Sell the pack instead of scrapping it.

A graded pack is a listed asset with a price. An ungraded pack is a liability with a disposal cost. The certificate is what moves a pack from the second column to the first, and the gap between those two numbers is what the certificate is worth.

How it starts
  1. 1 · Sample

    Send telemetry for ten packs you already know the answer on. We issue certificates blind and you check us against your own bench data.

  2. 2 · Calibrate

    We fit the grade bands to your resale market rather than a generic threshold, because A1 means nothing until it means a price.

  3. 3 · Run

    Certificates issued per pack or per batch, priced per certificate, no platform licence.

The other wedge
Wedge two

Underwriting engine

The risk score insurers and warranty providers price from.

Read it