Marland wrote:

on some vehicles with stop start, the condition of the battery and
its charging is monitored by the electronics as the battery ages
which is why the stop start ceases to function when the battery has
deteriorated to a point that complete failure is imminent. To get the
best out of it the new battery has to be registered with the vehicle

My car is stop/start (I'm just about used to its foibles after a couple
of years)

The stop/start won't operate until the engine oil is up to temperature
(so less viscous) and the strain on the belt alternator/starter is lower.

It also won't operate when there's a very high load from all the
auxiliaries (aircon, heated seats, etc)

It does have a higher capacity battery than the equivalent
non-stop/start car, but it's not a *special* battery that would need to
be registered to the car.