Dashboard range estimates, the odometer and the charge percentage all describe something different from battery health. Range readouts change with driving style, temperature and load. Odometer readings say nothing directly about the battery. A charge percentage tells you how full the battery is right now — not how much capacity it still has compared with when it was new.
The test reads the battery management system's own State of Health and cell-level data and analyses it against the original factory specification, then goes deeper into usable energy, cell voltage spread, temperature behaviour and high-voltage fault data. It also models a realistic range and five-year SOH projection from the tested data.