On 12/07/2019 13:45, Harry Bloomfield wrote:
dennis@home expressed precisely :
It relies on the built in sensors by the looks of things.
The cars computer can probably tell you the state of the battery
without it.

The ECU doesn't store that sort of information, that I am aware of, it
might store a failure to start, but that unit only seems to clip onto
the battery, so it cannot interrogate the car's ECU's.

What, using the ODB port?
It does say it has an ODB connector.