How to check battery health (SoH) before buying a used Neta

What SoH is and what counts as good

SoH (State of Health) is the pack's current capacity versus factory-new, as a percentage. A well-kept 2–3 year old car should sit around 90%+; below 80% is heavily degraded and should be priced accordingly. The LFP chemistry Neta uses is naturally cycle-tolerant, but frequent DC fast charging or long storage at full/empty still degrades it.

UsedNeta's 3-level evidence ladder

A self-typed SoH number costs nothing to fake, so it carries almost no evidentiary weight. Every UsedNeta listing is therefore graded on an evidence ladder:

• Level 1 — self-declared: the seller typed a number with no proof. Treat it as a negotiation starting point only.
• Level 2 — dated BMS/OBD screenshot: read from the actual car with an OBD app (e.g. Car Scanner + an ELM327 dongle). The date must be visible; ideally shot alongside the car/VIN.
• Level 3 — third-party inspection certificate: a battery report from an independent garage/inspection service with the VIN matching the car. The strongest evidence available.

The 30-minute self-check

At the viewing: (1) plug in an OBD dongle and read SoH, cell balance, and stored fault codes; (2) review charge history on the app/car screen — unusually heavy fast-charging is a yellow flag; (3) ask for real km per full charge and compare with spec — a claimed 95% SoH with real range at half of spec is not credible; (4) test-drive while watching percent-per-km consumption; (5) inspect the underbody for pack impact or flood marks.