At last, a very high mileage ZS EV under the microscpe

[wattmatters]

So it's as easy as plugging in an OBD dongle, then. There you go, sorted.

Yeah, not so fast. The on board SOH number you'll get from plugging in an OBD reader is a "black box" estimate of the battery's real state of health.

Unless and until the workings of that "black box" are made transparent, I would treat the number it provides with a large grain of salt.