EV resale markets suffer from information asymmetry – buyers fear hidden battery degradation.
Build a diagnostic tool that runs manufacturer-approved battery tests (cycle count, charge curves, thermal performance) and generates tamper-proof reports.
Sell to dealerships as a value-added service, or directly to private sellers as a certification badge ($20-$50 per report).
Start by reverse-engineering OBD-II protocols for top 3 EV models, displaying basic health metrics.
Risk: Car makers may launch competing services or restrict diagnostic access.