Synthetic demonstration. This is a specimen on synthetic data - no physical battery was measured. It exists to prove the cryptographic report chain end-to-end. Method accuracy is validated separately on the public Oxford dataset: 0.80 pp MAE, raw and uncorrected, on 8 NMC cells over 519 reference points - two of the three methods (the OCV method cannot run on that protocol). Conditional coverage below 80% SOH is an open defect we publish rather than hide; see METHODOLOGY.md §7.
BL-2026-0048
SPECIMEN - synthetic demonstration (no physical battery)
84.03
% State of Health · ±0.8 pp method-agreement band
Decision (illustrative)
APPROVED
Residual value (illustrative)
SEK 42,000
Premium indication (illustrative)
-8% vs unverified
Remaining life (illustrative)
8.4 years
What the signed report contains
Coulomb counting83.77%
Capacity test83.90%
OCV model84.43%
OEM reported81.4% (within tolerance)
Equally weighted over 96,480 synthetic data points. Read that honestly: all three methods run here only because we generated this data ourselves. On the one dataset we did not generate - Oxford - the OCV method cannot run at all (0 of 519 checkpoints), so our method combination has never been validated on real cells as a combination. The ±0.8 pp above is the variance floor in our fusion code, not a measured uncertainty; the interval we can actually defend is a conformal ±0.60 pp, derived from held-out error on Oxford. Agreement on synthetic data demonstrates the pipeline; it does not prove accuracy. The signature below proves this report was not altered.
Reported SOH: 84.03% (84.03 = the original, signed value)
This page sends the report to the public API POST /api/v1/verify. The server recomputes the SHA-256 hash and checks the Ed25519 signature. Change one number and the certificate no longer matches - tamper-evident, no trust in us required. Svenska